91981453 has 2 divisors, whose sum is σ = 91981454. Its totient is φ = 91981452.

The previous prime is 91981403. The next prime is 91981457. The reversal of 91981453 is 35418919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60419529 + 31561924 = 7773^2 + 5618^2 .

It is a cyclic number.

It is not a de Polignac number, because 91981453 - 2²⁵ = 58427021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91981457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45990726 + 45990727.

It is an arithmetic number, because the mean of its divisors is an integer number (45990727).

Almost surely, 2^91981453 is an apocalyptic number.

It is an amenable number.

91981453 is a deficient number, since it is larger than the sum of its proper divisors (1).

91981453 is an equidigital number, since it uses as much as digits as its factorization.

91981453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 91981453 is about 9590.6961686835. The cubic root of 91981453 is about 451.4054053538.

The spelling of 91981453 in words is "ninety-one million, nine hundred eighty-one thousand, four hundred fifty-three".