91139074 has 16 divisors (see below), whose sum is σ = 155885688. Its totient is φ = 39589632.

The previous prime is 91139071. The next prime is 91139093. The reversal of 91139074 is 47093119.

It can be written as a sum of positive squares in 4 ways, for example, as 90725625 + 413449 = 9525^2 + 643^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (91139071) 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, 102657 + ... + 103540.

Almost surely, 2^91139074 is an apocalyptic number.

91139074 is a deficient number, since it is larger than the sum of its proper divisors (64746614).

91139074 is a wasteful number, since it uses less digits than its factorization.

91139074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206229.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 91139074 is about 9546.6786894710. The cubic root of 91139074 is about 450.0231658856.

The spelling of 91139074 in words is "ninety-one million, one hundred thirty-nine thousand, seventy-four".