91651560 has 384 divisors, whose sum is σ = 379209600. Its totient is φ = 17418240.

The previous prime is 91651559. The next prime is 91651589. The reversal of 91651560 is 6515619.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 840786 + ... + 840894.

It is an arithmetic number, because the mean of its divisors is an integer number (987525).

Almost surely, 2^91651560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91651560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189604800).

91651560 is an abundant number, since it is smaller than the sum of its proper divisors (287558040).

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

91651560 is a wasteful number, since it uses less digits than its factorization.

91651560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 91651560 is about 9573.4821251204. The cubic root of 91651560 is about 450.8651012548.

The spelling of 91651560 in words is "ninety-one million, six hundred fifty-one thousand, five hundred sixty".