91972927 has 2 divisors, whose sum is σ = 91972928. Its totient is φ = 91972926.

The previous prime is 91972897. The next prime is 91972931. The reversal of 91972927 is 72927919.

It is a strong prime.

It is an emirp because it is prime and its reverse (72927919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91972927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91972987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45986463 + 45986464.

It is an arithmetic number, because the mean of its divisors is an integer number (45986464).

Almost surely, 2^91972927 is an apocalyptic number.

91972927 is a deficient number, since it is larger than the sum of its proper divisors (1).

91972927 is an equidigital number, since it uses as much as digits as its factorization.

91972927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The square root of 91972927 is about 9590.2516651024. The cubic root of 91972927 is about 451.3914576093.

The spelling of 91972927 in words is "ninety-one million, nine hundred seventy-two thousand, nine hundred twenty-seven".