91091042 has 16 divisors (see below), whose sum is σ = 156323520. Its totient is φ = 38997168.

The previous prime is 91091041. The next prime is 91091081. The reversal of 91091042 is 24019019.

It is not an unprimeable number, because it can be changed into a prime (91091041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12593 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (9770220).

Almost surely, 2^91091042 is an apocalyptic number.

91091042 is a deficient number, since it is larger than the sum of its proper divisors (65232478).

91091042 is a wasteful number, since it uses less digits than its factorization.

91091042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 91091042 is about 9544.1627186464. The cubic root of 91091042 is about 449.9440951127.

The spelling of 91091042 in words is "ninety-one million, ninety-one thousand, forty-two".