91422971 has 4 divisors (see below), whose sum is σ = 91461000. Its totient is φ = 91384944.

The previous prime is 91422913. The next prime is 91422979. The reversal of 91422971 is 17922419.

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 91422971 - 2¹⁰ = 91421947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91422979) 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, 15146 + ... + 20303.

It is an arithmetic number, because the mean of its divisors is an integer number (22865250).

Almost surely, 2^91422971 is an apocalyptic number.

91422971 is a deficient number, since it is larger than the sum of its proper divisors (38029).

91422971 is a wasteful number, since it uses less digits than its factorization.

91422971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38028.

The product of its digits is 9072, while the sum is 35.

The square root of 91422971 is about 9561.5360167705. The cubic root of 91422971 is about 450.4899535947.

The spelling of 91422971 in words is "ninety-one million, four hundred twenty-two thousand, nine hundred seventy-one".