91377655 has 4 divisors (see below), whose sum is σ = 109653192. Its totient is φ = 73102120.

The previous prime is 91377653. The next prime is 91377659. The reversal of 91377655 is 55677319.

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

It is not a de Polignac number, because 91377655 - 2¹ = 91377653 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 (91377653) 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, 9137761 + ... + 9137770.

It is an arithmetic number, because the mean of its divisors is an integer number (27413298).

Almost surely, 2^91377655 is an apocalyptic number.

91377655 is a deficient number, since it is larger than the sum of its proper divisors (18275537).

91377655 is a wasteful number, since it uses less digits than its factorization.

91377655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18275536.

The product of its digits is 198450, while the sum is 43.

The square root of 91377655 is about 9559.1660201087. The cubic root of 91377655 is about 450.4155092240.

The spelling of 91377655 in words is "ninety-one million, three hundred seventy-seven thousand, six hundred fifty-five".