91830157 has 4 divisors (see below), whose sum is σ = 91875420. Its totient is φ = 91784896.

The previous prime is 91830149. The next prime is 91830161. The reversal of 91830157 is 75103819.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21706281 + 70123876 = 4659^2 + 8374^2 .

It is a cyclic number.

It is not a de Polignac number, because 91830157 - 2³ = 91830149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91830187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19438 + ... + 23695.

It is an arithmetic number, because the mean of its divisors is an integer number (22968855).

Almost surely, 2^91830157 is an apocalyptic number.

It is an amenable number.

91830157 is a deficient number, since it is larger than the sum of its proper divisors (45263).

91830157 is a wasteful number, since it uses less digits than its factorization.

91830157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45262.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 91830157 is about 9582.8052782053. The cubic root of 91830157 is about 451.1577709674.

The spelling of 91830157 in words is "ninety-one million, eight hundred thirty thousand, one hundred fifty-seven".