91521167 has 4 divisors (see below), whose sum is σ = 93021576. Its totient is φ = 90020760.

The previous prime is 91521161. The next prime is 91521191. The reversal of 91521167 is 76112519.

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

It is a cyclic number.

It is not a de Polignac number, because 91521167 - 2⁴ = 91521151 is a prime.

It is a super-2 number, since 2×91521167² = 16752248018083778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91521161) 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, 750113 + ... + 750234.

It is an arithmetic number, because the mean of its divisors is an integer number (23255394).

Almost surely, 2^91521167 is an apocalyptic number.

91521167 is a deficient number, since it is larger than the sum of its proper divisors (1500409).

91521167 is a wasteful number, since it uses less digits than its factorization.

91521167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500408.

The product of its digits is 3780, while the sum is 32.

The square root of 91521167 is about 9566.6695876883. The cubic root of 91521167 is about 450.6511839820.

The spelling of 91521167 in words is "ninety-one million, five hundred twenty-one thousand, one hundred sixty-seven".