91673911729 has 9 divisors (see below), whose sum is σ = 94736228601. Its totient is φ = 88707605460.

The previous prime is 91673911709. The next prime is 91673911733. The reversal of 91673911729 is 92711937619.

The square root of 91673911729 is 302777.

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

It is not a de Polignac number, because 91673911729 - 2²⁵ = 91640357297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91673911729.

It is not an unprimeable number, because it can be changed into a prime (91673911709) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9381204 + ... + 9390970.

Almost surely, 2^91673911729 is an apocalyptic number.

91673911729 is the 302777-th square number.

91673911729 is the 151389-th centered octagonal number.

It is an amenable number.

91673911729 is a deficient number, since it is larger than the sum of its proper divisors (3062316872).

91673911729 is an frugal number, since it uses more digits than its factorization.

91673911729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19596 (or 9798 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 55.

The spelling of 91673911729 in words is "ninety-one billion, six hundred seventy-three million, nine hundred eleven thousand, seven hundred twenty-nine".