91897453 has 2 divisors, whose sum is σ = 91897454. Its totient is φ = 91897452.

The previous prime is 91897447. The next prime is 91897457. The reversal of 91897453 is 35479819.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89832484 + 2064969 = 9478^2 + 1437^2 .

It is a cyclic number.

It is not a de Polignac number, because 91897453 - 2⁹ = 91896941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91897457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45948726 + 45948727.

It is an arithmetic number, because the mean of its divisors is an integer number (45948727).

Almost surely, 2^91897453 is an apocalyptic number.

It is an amenable number.

91897453 is a deficient number, since it is larger than the sum of its proper divisors (1).

91897453 is an equidigital number, since it uses as much as digits as its factorization.

91897453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 91897453 is about 9586.3159242746. The cubic root of 91897453 is about 451.2679515473.

The spelling of 91897453 in words is "ninety-one million, eight hundred ninety-seven thousand, four hundred fifty-three".