91252090 has 16 divisors (see below), whose sum is σ = 173916072. Its totient is φ = 34353664.

The previous prime is 91252087. The next prime is 91252123. The reversal of 91252090 is 9025219.

It can be written as a sum of positive squares in 4 ways, for example, as 79370281 + 11881809 = 8909^2 + 3447^2 .

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, 268219 + ... + 268558.

Almost surely, 2^91252090 is an apocalyptic number.

91252090 is a deficient number, since it is larger than the sum of its proper divisors (82663982).

91252090 is a wasteful number, since it uses less digits than its factorization.

91252090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536801.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 91252090 is about 9552.5959822448. The cubic root of 91252090 is about 450.2091044651.

The spelling of 91252090 in words is "ninety-one million, two hundred fifty-two thousand, ninety".