231539425 has 12 divisors (see below), whose sum is σ = 309194620. Its totient is φ = 170982720.

The previous prime is 231539411. The next prime is 231539431. The reversal of 231539425 is 524935132.

It can be written as a sum of positive squares in 6 ways, for example, as 17239104 + 214300321 = 4152^2 + 14639^2 .

It is not a de Polignac number, because 231539425 - 2¹¹ = 231537377 is a prime.

It is a super-2 number, since 2×231539425² = 107221010658661250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355890 + ... + 356539.

Almost surely, 2^231539425 is an apocalyptic number.

231539425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231539425 is a deficient number, since it is larger than the sum of its proper divisors (77655195).

231539425 is a wasteful number, since it uses less digits than its factorization.

231539425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712452 (or 712447 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 231539425 is about 15216.4195854347. The cubic root of 231539425 is about 614.0564772786.

The spelling of 231539425 in words is "two hundred thirty-one million, five hundred thirty-nine thousand, four hundred twenty-five".