401252531 has 6 divisors (see below), whose sum is σ = 412391700. Its totient is φ = 390406536.

The previous prime is 401252519. The next prime is 401252573. The reversal of 401252531 is 135252104.

It is a de Polignac number, because none of the positive numbers 2^k-401252531 is a prime.

It is a super-2 number, since 2×401252531² = 322007187267811922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401252497 and 401252506.

It is not an unprimeable number, because it can be changed into a prime (401252231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145181 + ... + 147918.

It is an arithmetic number, because the mean of its divisors is an integer number (68731950).

Almost surely, 2^401252531 is an apocalyptic number.

401252531 is a deficient number, since it is larger than the sum of its proper divisors (11139169).

401252531 is an equidigital number, since it uses as much as digits as its factorization.

401252531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293173 (or 293136 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 401252531 is about 20031.2888002744. The cubic root of 401252531 is about 737.5745590042.

The spelling of 401252531 in words is "four hundred one million, two hundred fifty-two thousand, five hundred thirty-one".