91158418 has 16 divisors (see below), whose sum is σ = 147510720. Its totient is φ = 42000336.

The previous prime is 91158413. The next prime is 91158421. The reversal of 91158418 is 81485119.

It is not an unprimeable number, because it can be changed into a prime (91158413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14113 + ... + 19531.

It is an arithmetic number, because the mean of its divisors is an integer number (9219420).

Almost surely, 2^91158418 is an apocalyptic number.

91158418 is a deficient number, since it is larger than the sum of its proper divisors (56352302).

91158418 is a wasteful number, since it uses less digits than its factorization.

91158418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081.

The product of its digits is 11520, while the sum is 37.

The square root of 91158418 is about 9547.6917629341. The cubic root of 91158418 is about 450.0550023304.

The spelling of 91158418 in words is "ninety-one million, one hundred fifty-eight thousand, four hundred eighteen".