91130290 has 16 divisors (see below), whose sum is σ = 168036120. Its totient is φ = 35562880.

The previous prime is 91130269. The next prime is 91130309. The reversal of 91130290 is 9203119.

It can be written as a sum of positive squares in 4 ways, for example, as 75186241 + 15944049 = 8671^2 + 3993^2 .

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, 110725 + ... + 111544.

Almost surely, 2^91130290 is an apocalyptic number.

91130290 is a deficient number, since it is larger than the sum of its proper divisors (76905830).

91130290 is a wasteful number, since it uses less digits than its factorization.

91130290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222317.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 91130290 is about 9546.2186230989. The cubic root of 91130290 is about 450.0087076504.

The spelling of 91130290 in words is "ninety-one million, one hundred thirty thousand, two hundred ninety".