91887157 has 4 divisors (see below), whose sum is σ = 92226496. Its totient is φ = 91547820.

The previous prime is 91887149. The next prime is 91887181. The reversal of 91887157 is 75178819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91887157 - 2³ = 91887149 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 (91887137) 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, 169263 + ... + 169804.

It is an arithmetic number, because the mean of its divisors is an integer number (23056624).

Almost surely, 2^91887157 is an apocalyptic number.

It is an amenable number.

91887157 is a deficient number, since it is larger than the sum of its proper divisors (339339).

91887157 is a wasteful number, since it uses less digits than its factorization.

91887157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339338.

The product of its digits is 141120, while the sum is 46.

The square root of 91887157 is about 9585.7788937571. The cubic root of 91887157 is about 451.2510978762.

The spelling of 91887157 in words is "ninety-one million, eight hundred eighty-seven thousand, one hundred fifty-seven".