91581996 has 36 divisors (see below), whose sum is σ = 234887576. Its totient is φ = 27751680.

The previous prime is 91581947. The next prime is 91582013. The reversal of 91581996 is 69918519.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30085 + ... + 32988.

Almost surely, 2^91581996 is an apocalyptic number.

It is an amenable number.

91581996 is an abundant number, since it is smaller than the sum of its proper divisors (143305580).

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

91581996 is a wasteful number, since it uses less digits than its factorization.

91581996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63102 (or 63089 counting only the distinct ones).

The product of its digits is 174960, while the sum is 48.

The square root of 91581996 is about 9569.8482746593. The cubic root of 91581996 is about 450.7510027482.

The spelling of 91581996 in words is "ninety-one million, five hundred eighty-one thousand, nine hundred ninety-six".