1231937945329 has 27 divisors (see below), whose sum is σ = 1551913822017. Its totient is φ = 974640217824.

The previous prime is 1231937945309. The next prime is 1231937945339. The reversal of 1231937945329 is 9235497391321.

The square root of 1231937945329 is 1109927.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 37026610929 + 1194911334400 = 192423^2 + 1093120^2 .

It is not a de Polignac number, because 1231937945329 - 2²⁷ = 1231803727601 is a prime.

It is a super-2 number, since 2×1231937945329² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231937945309) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 100997259 + ... + 101009455.

Almost surely, 2^{1231937945329} is an apocalyptic number.

1231937945329 is the 1109927-th square number.

1231937945329 is the 554964-th centered octagonal number.

It is an amenable number.

1231937945329 is a deficient number, since it is larger than the sum of its proper divisors (319975876688).

1231937945329 is an frugal number, since it uses more digits than its factorization.

1231937945329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24434 (or 12217 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 58.

The spelling of 1231937945329 in words is "one trillion, two hundred thirty-one billion, nine hundred thirty-seven million, nine hundred forty-five thousand, three hundred twenty-nine".