401331625 has 8 divisors (see below), whose sum is σ = 500862024. Its totient is φ = 321065200.

The previous prime is 401331607. The next prime is 401331647. The reversal of 401331625 is 526133104.

It can be written as a sum of positive squares in 4 ways, for example, as 67026969 + 334304656 = 8187^2 + 18284^2 .

It is not a de Polignac number, because 401331625 - 2⁹ = 401331113 is a prime.

It is a super-2 number, since 2×401331625² = 322134146450281250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401331625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605202 + ... + 1605451.

It is an arithmetic number, because the mean of its divisors is an integer number (62607753).

Almost surely, 2^401331625 is an apocalyptic number.

It is an amenable number.

401331625 is a deficient number, since it is larger than the sum of its proper divisors (99530399).

401331625 is an equidigital number, since it uses as much as digits as its factorization.

401331625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210668 (or 3210658 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 401331625 is about 20033.2629643800. The cubic root of 401331625 is about 737.6230188352.

Adding to 401331625 its reverse (526133104), we get a palindrome (927464729).

It can be divided in two parts, 401331 and 625, that added together give a square (401956 = 634²).

The spelling of 401331625 in words is "four hundred one million, three hundred thirty-one thousand, six hundred twenty-five".