231723153945 has 32 divisors (see below), whose sum is σ = 412034163840. Its totient is φ = 123561115200.

The previous prime is 231723153941. The next prime is 231723153967. The reversal of 231723153945 is 549351327132.

231723153945 is a `hidden beast` number, since 2 + 3 + 1 + 72 + 3 + 1 + 539 + 45 = 666.

It is not a de Polignac number, because 231723153945 - 2² = 231723153941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 231723153945.

It is not an unprimeable number, because it can be changed into a prime (231723153941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521395 + ... + 857495.

It is an arithmetic number, because the mean of its divisors is an integer number (12876067620).

Almost surely, 2^231723153945 is an apocalyptic number.

It is an amenable number.

231723153945 is a deficient number, since it is larger than the sum of its proper divisors (180311009895).

231723153945 is a wasteful number, since it uses less digits than its factorization.

231723153945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341222 (or 341216 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The spelling of 231723153945 in words is "two hundred thirty-one billion, seven hundred twenty-three million, one hundred fifty-three thousand, nine hundred forty-five".