1401231625 has 16 divisors (see below), whose sum is σ = 1796006160. Its totient is φ = 1090684800.

The previous prime is 1401231607. The next prime is 1401231659. The reversal of 1401231625 is 5261321041.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 595750464 + 805481161 = 24408^2 + 28381^2 .

It is not a de Polignac number, because 1401231625 - 2²⁷ = 1267013897 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1401231625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146860 + ... + 156109.

It is an arithmetic number, because the mean of its divisors is an integer number (112250385).

Almost surely, 2^1401231625 is an apocalyptic number.

It is an amenable number.

1401231625 is a deficient number, since it is larger than the sum of its proper divisors (394774535).

1401231625 is an equidigital number, since it uses as much as digits as its factorization.

1401231625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303021 (or 303011 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1401231625 is about 37433.0285309645. The cubic root of 1401231625 is about 1119.0168948034.

Adding to 1401231625 its reverse (5261321041), we get a palindrome (6662552666).

It can be divided in two parts, 1401231 and 625, that added together give a square (1401856 = 1184²).

The spelling of 1401231625 in words is "one billion, four hundred one million, two hundred thirty-one thousand, six hundred twenty-five".