91429627693 has 4 divisors (see below), whose sum is σ = 91452415068. Its totient is φ = 91406840320.

The previous prime is 91429627687. The next prime is 91429627733. The reversal of 91429627693 is 39672692419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39672692419 = 13099 ⋅3028681.

It can be written as a sum of positive squares in 2 ways, for example, as 85894714084 + 5534913609 = 293078^2 + 74397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91429627693 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 (91429627603) 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, 11387668 + ... + 11395693.

It is an arithmetic number, because the mean of its divisors is an integer number (22863103767).

Almost surely, 2^91429627693 is an apocalyptic number.

It is an amenable number.

91429627693 is a deficient number, since it is larger than the sum of its proper divisors (22787375).

91429627693 is a wasteful number, since it uses less digits than its factorization.

91429627693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22787374.

The product of its digits is 8817984, while the sum is 58.

The spelling of 91429627693 in words is "ninety-one billion, four hundred twenty-nine million, six hundred twenty-seven thousand, six hundred ninety-three".