91372077 has 16 divisors (see below), whose sum is σ = 141252480. Its totient is φ = 58265856.

The previous prime is 91372049. The next prime is 91372091. The reversal of 91372077 is 77027319.

It is not a de Polignac number, because 91372077 - 2¹² = 91367981 is a prime.

It is a super-4 number, since 4×91372077⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91372027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72948 + ... + 74189.

It is an arithmetic number, because the mean of its divisors is an integer number (8828280).

Almost surely, 2^91372077 is an apocalyptic number.

It is an amenable number.

91372077 is a deficient number, since it is larger than the sum of its proper divisors (49880403).

91372077 is a wasteful number, since it uses less digits than its factorization.

91372077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147169 (or 147163 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 91372077 is about 9558.8742538021. The cubic root of 91372077 is about 450.4063440773.

The spelling of 91372077 in words is "ninety-one million, three hundred seventy-two thousand, seventy-seven".