90931564091687 has 4 divisors (see below), whose sum is σ = 99198069918216. Its totient is φ = 82665058265160.

The previous prime is 90931564091597. The next prime is 90931564091743. The reversal of 90931564091687 is 78619046513909.

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

It is a cyclic number.

It is not a de Polignac number, because 90931564091687 - 2⁴⁶ = 20562819914023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90931564091287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133252913248 + ... + 4133252913269.

It is an arithmetic number, because the mean of its divisors is an integer number (24799517479554).

Almost surely, 2^{90931564091687} is an apocalyptic number.

90931564091687 is a deficient number, since it is larger than the sum of its proper divisors (8266505826529).

90931564091687 is a wasteful number, since it uses less digits than its factorization.

90931564091687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8266505826528.

The product of its (nonzero) digits is 88179840, while the sum is 68.

The spelling of 90931564091687 in words is "ninety trillion, nine hundred thirty-one billion, five hundred sixty-four million, ninety-one thousand, six hundred eighty-seven".