91018938 has 16 divisors (see below), whose sum is σ = 182160576. Its totient is φ = 30319200.

The previous prime is 91018913. The next prime is 91018943. The reversal of 91018938 is 83981019.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 91018896 and 91018905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6595 + ... + 15017.

It is an arithmetic number, because the mean of its divisors is an integer number (11385036).

Almost surely, 2^91018938 is an apocalyptic number.

91018938 is an abundant number, since it is smaller than the sum of its proper divisors (91141638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91018938 is a wasteful number, since it uses less digits than its factorization.

91018938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10229.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 91018938 is about 9540.3845834432. The cubic root of 91018938 is about 449.8253445666.

The spelling of 91018938 in words is "ninety-one million, eighteen thousand, nine hundred thirty-eight".