91561662 has 24 divisors (see below), whose sum is σ = 204784320. Its totient is φ = 29535840.

The previous prime is 91561649. The next prime is 91561667. The reversal of 91561662 is 26616519.

91561662 is a `hidden beast` number, since 91 + 561 + 6 + 6 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91561667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81487 + ... + 82602.

It is an arithmetic number, because the mean of its divisors is an integer number (8532680).

Almost surely, 2^91561662 is an apocalyptic number.

91561662 is an abundant number, since it is smaller than the sum of its proper divisors (113222658).

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

91561662 is a wasteful number, since it uses less digits than its factorization.

91561662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164128 (or 164125 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 91561662 is about 9568.7858163928. The cubic root of 91561662 is about 450.7176401161.

The spelling of 91561662 in words is "ninety-one million, five hundred sixty-one thousand, six hundred sixty-two".