231500025 has 72 divisors (see below), whose sum is σ = 438721920. Its totient is φ = 120968640.

The previous prime is 231500023. The next prime is 231500029. The reversal of 231500025 is 520005132.

It is a happy number.

It is not a de Polignac number, because 231500025 - 2¹ = 231500023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231499980 and 231500007.

It is not an unprimeable number, because it can be changed into a prime (231500023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 321616 + ... + 322334.

It is an arithmetic number, because the mean of its divisors is an integer number (6093360).

Almost surely, 2^231500025 is an apocalyptic number.

231500025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231500025 is a deficient number, since it is larger than the sum of its proper divisors (207221895).

231500025 is an equidigital number, since it uses as much as digits as its factorization.

231500025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 231500025 is about 15215.1248762539. The cubic root of 231500025 is about 614.0216449131.

Adding to 231500025 its reverse (520005132), we get a palindrome (751505157).

The spelling of 231500025 in words is "two hundred thirty-one million, five hundred thousand, twenty-five".