91159090 has 32 divisors (see below), whose sum is σ = 179397504. Its totient is φ = 33075840.

The previous prime is 91159087. The next prime is 91159091. The reversal of 91159090 is 9095119.

It is not an unprimeable number, because it can be changed into a prime (91159091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93787 + ... + 94753.

It is an arithmetic number, because the mean of its divisors is an integer number (5606172).

Almost surely, 2^91159090 is an apocalyptic number.

91159090 is a deficient number, since it is larger than the sum of its proper divisors (88238414).

91159090 is a wasteful number, since it uses less digits than its factorization.

91159090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 91159090 is about 9547.7269546212. The cubic root of 91159090 is about 450.0561082302.

The spelling of 91159090 in words is "ninety-one million, one hundred fifty-nine thousand, ninety".