231015625 has 16 divisors (see below), whose sum is σ = 288866448. Its totient is φ = 184750000.

The previous prime is 231015619. The next prime is 231015649. The reversal of 231015625 is 526510132.

It can be written as a sum of positive squares in 8 ways, for example, as 142730809 + 88284816 = 11947^2 + 9396^2 .

It is not a de Polignac number, because 231015625 - 2⁵ = 231015593 is a prime.

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 231015625.

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, 76647 + ... + 79603.

It is an arithmetic number, because the mean of its divisors is an integer number (18054153).

Almost surely, 2^231015625 is an apocalyptic number.

231015625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231015625 is a deficient number, since it is larger than the sum of its proper divisors (57850823).

231015625 is an frugal number, since it uses more digits than its factorization.

231015625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992 (or 2962 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 231015625 is about 15199.1981696404. The cubic root of 231015625 is about 613.5930779626.

Adding to 231015625 its reverse (526510132), we get a palindrome (757525757).

The spelling of 231015625 in words is "two hundred thirty-one million, fifteen thousand, six hundred twenty-five".