1231953928172 has 24 divisors (see below), whose sum is σ = 2352052769472. Its totient is φ = 559945552400.

The previous prime is 1231953928157. The next prime is 1231953928211. The reversal of 1231953928172 is 2718293591321.

It is a super-3 number, since 3×1231953928172³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86354 + ... + 1572057.

It is an arithmetic number, because the mean of its divisors is an integer number (98002198728).

Almost surely, 2^{1231953928172} is an apocalyptic number.

It is an amenable number.

1231953928172 is a deficient number, since it is larger than the sum of its proper divisors (1120098841300).

1231953928172 is a wasteful number, since it uses less digits than its factorization.

1231953928172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675309 (or 1675307 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The spelling of 1231953928172 in words is "one trillion, two hundred thirty-one billion, nine hundred fifty-three million, nine hundred twenty-eight thousand, one hundred seventy-two".