1531315794906 has 12 divisors (see below), whose sum is σ = 3317850889002. Its totient is φ = 510438598296.

The previous prime is 1531315794901. The next prime is 1531315794923. The reversal of 1531315794906 is 6094975131351.

1531315794906 is a `hidden beast` number, since 1 + 5 + 31 + 31 + 579 + 4 + 9 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1119594655881 + 411721139025 = 1058109^2 + 641655^2 .

It is not an unprimeable number, because it can be changed into a prime (1531315794901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42536549841 + ... + 42536549876.

Almost surely, 2^{1531315794906} is an apocalyptic number.

1531315794906 is an abundant number, since it is smaller than the sum of its proper divisors (1786535094096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531315794906 is a wasteful number, since it uses less digits than its factorization.

1531315794906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85073099725 (or 85073099722 counting only the distinct ones).

The product of its (nonzero) digits is 3061800, while the sum is 54.

The spelling of 1531315794906 in words is "one trillion, five hundred thirty-one billion, three hundred fifteen million, seven hundred ninety-four thousand, nine hundred six".