91163990 has 8 divisors (see below), whose sum is σ = 164095200. Its totient is φ = 36465592.

The previous prime is 91163981. The next prime is 91164037. The reversal of 91163990 is 9936119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4558190 + ... + 4558209.

It is an arithmetic number, because the mean of its divisors is an integer number (20511900).

Almost surely, 2^91163990 is an apocalyptic number.

91163990 is a deficient number, since it is larger than the sum of its proper divisors (72931210).

91163990 is a wasteful number, since it uses less digits than its factorization.

91163990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116406.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 91163990 is about 9547.9835567517. The cubic root of 91163990 is about 450.0641719183.

The spelling of 91163990 in words is "ninety-one million, one hundred sixty-three thousand, nine hundred ninety".