231220145325 has 48 divisors (see below), whose sum is σ = 411744966080. Its totient is φ = 113816378880.

The previous prime is 231220145297. The next prime is 231220145347. The reversal of 231220145325 is 523541022132.

It is not a de Polignac number, because 231220145325 - 2⁵ = 231220145293 is a prime.

It is a super-2 number, since 2×231220145325² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231220145292 and 231220145301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12294129 + ... + 12312921.

Almost surely, 2^231220145325 is an apocalyptic number.

231220145325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231220145325 is a deficient number, since it is larger than the sum of its proper divisors (180524820755).

231220145325 is a wasteful number, since it uses less digits than its factorization.

231220145325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31438 (or 31433 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 231220145325 its reverse (523541022132), we get a palindrome (754761167457).

The spelling of 231220145325 in words is "two hundred thirty-one billion, two hundred twenty million, one hundred forty-five thousand, three hundred twenty-five".