87731266051009 has 45 divisors (see below), whose sum is σ = 107003273308449. Its totient is φ = 71920085224680.

The previous prime is 87731266050929. The next prime is 87731266051043. The reversal of 87731266051009 is 90015066213778.

The square root of 87731266051009 is 9366497.

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

It is not a de Polignac number, because 87731266051009 - 2³¹ = 87729118567361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87731266051309) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 10556037964 + ... + 10556046274.

Almost surely, 2^{87731266051009} is an apocalyptic number.

87731266051009 is the 9366497-th square number.

87731266051009 is the 4683249-th centered octagonal number.

It is an amenable number.

87731266051009 is a deficient number, since it is larger than the sum of its proper divisors (19272007257440).

87731266051009 is an frugal number, since it uses more digits than its factorization.

87731266051009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16696 (or 8341 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 87731266051009 in words is "eighty-seven trillion, seven hundred thirty-one billion, two hundred sixty-six million, fifty-one thousand, nine".