231325405551 has 16 divisors (see below), whose sum is σ = 342714503520. Its totient is φ = 154212347520.

The previous prime is 231325405547. The next prime is 231325405559. The reversal of 231325405551 is 155504523132.

231325405551 is a `hidden beast` number, since 2 + 3 + 13 + 2 + 540 + 55 + 51 = 666.

It is not a de Polignac number, because 231325405551 - 2² = 231325405547 is a prime.

It is a super-2 number, since 2×231325405551² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231325405559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 967591 + ... + 1182743.

It is an arithmetic number, because the mean of its divisors is an integer number (21419656470).

Almost surely, 2^231325405551 is an apocalyptic number.

231325405551 is a deficient number, since it is larger than the sum of its proper divisors (111389097969).

231325405551 is a wasteful number, since it uses less digits than its factorization.

231325405551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254983 (or 254977 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 231325405551 its reverse (155504523132), we get a palindrome (386829928683).

The spelling of 231325405551 in words is "two hundred thirty-one billion, three hundred twenty-five million, four hundred five thousand, five hundred fifty-one".