1231506031265 has 4 divisors (see below), whose sum is σ = 1477807237524. Its totient is φ = 985204825008.

The previous prime is 1231506031163. The next prime is 1231506031277. The reversal of 1231506031265 is 5621306051321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 787429066384 + 444076964881 = 887372^2 + 666391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231506031265 - 2¹⁴ = 1231506014881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123150603122 + ... + 123150603131.

It is an arithmetic number, because the mean of its divisors is an integer number (369451809381).

Almost surely, 2^{1231506031265} is an apocalyptic number.

It is an amenable number.

1231506031265 is a deficient number, since it is larger than the sum of its proper divisors (246301206259).

1231506031265 is an equidigital number, since it uses as much as digits as its factorization.

1231506031265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246301206258.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 1231506031265 in words is "one trillion, two hundred thirty-one billion, five hundred six million, thirty-one thousand, two hundred sixty-five".