91015394 has 16 divisors (see below), whose sum is σ = 138131136. Its totient is φ = 44974800.

The previous prime is 91015387. The next prime is 91015429. The reversal of 91015394 is 49351019.

It is a self number, because there is not a number n which added to its sum of digits gives 91015394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80924 + ... + 82040.

It is an arithmetic number, because the mean of its divisors is an integer number (8633196).

Almost surely, 2^91015394 is an apocalyptic number.

91015394 is a deficient number, since it is larger than the sum of its proper divisors (47115742).

91015394 is a wasteful number, since it uses less digits than its factorization.

91015394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 91015394 is about 9540.1988448879. The cubic root of 91015394 is about 449.8195062149.

The spelling of 91015394 in words is "ninety-one million, fifteen thousand, three hundred ninety-four".