91980451 has 2 divisors, whose sum is σ = 91980452. Its totient is φ = 91980450.

The previous prime is 91980437. The next prime is 91980527. The reversal of 91980451 is 15408919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91980451 - 2⁷ = 91980323 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91980451.

It is not a weakly prime, because it can be changed into another prime (91980401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45990225 + 45990226.

It is an arithmetic number, because the mean of its divisors is an integer number (45990226).

Almost surely, 2^91980451 is an apocalyptic number.

91980451 is a deficient number, since it is larger than the sum of its proper divisors (1).

91980451 is an equidigital number, since it uses as much as digits as its factorization.

91980451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 91980451 is about 9590.6439304147. The cubic root of 91980451 is about 451.4037662195.

The spelling of 91980451 in words is "ninety-one million, nine hundred eighty thousand, four hundred fifty-one".