91982897 has 4 divisors (see below), whose sum is σ = 92388336. Its totient is φ = 91577460.

The previous prime is 91982887. The next prime is 91982899. The reversal of 91982897 is 79828919.

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 91982897 - 2²² = 87788593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91982899) 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, 202379 + ... + 202832.

It is an arithmetic number, because the mean of its divisors is an integer number (23097084).

Almost surely, 2^91982897 is an apocalyptic number.

It is an amenable number.

91982897 is a deficient number, since it is larger than the sum of its proper divisors (405439).

91982897 is a wasteful number, since it uses less digits than its factorization.

91982897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405438.

The product of its digits is 653184, while the sum is 53.

The square root of 91982897 is about 9590.7714496802. The cubic root of 91982897 is about 451.4077675184.

The spelling of 91982897 in words is "ninety-one million, nine hundred eighty-two thousand, eight hundred ninety-seven".