91561116 has 24 divisors (see below), whose sum is σ = 226210320. Its totient is φ = 28724992.

The previous prime is 91561111. The next prime is 91561121. The reversal of 91561116 is 61116519.

It is an interprime number because it is at equal distance from previous prime (91561111) and next prime (91561121).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91561111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224211 + ... + 224618.

It is an arithmetic number, because the mean of its divisors is an integer number (9425430).

Almost surely, 2^91561116 is an apocalyptic number.

It is an amenable number.

91561116 is an abundant number, since it is smaller than the sum of its proper divisors (134649204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91561116 is a wasteful number, since it uses less digits than its factorization.

91561116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448853 (or 448851 counting only the distinct ones).

The product of its digits is 1620, while the sum is 30.

The square root of 91561116 is about 9568.7572860848. The cubic root of 91561116 is about 450.7167442086.

The spelling of 91561116 in words is "ninety-one million, five hundred sixty-one thousand, one hundred sixteen".