91857473 has 2 divisors, whose sum is σ = 91857474. Its totient is φ = 91857472.

The previous prime is 91857401. The next prime is 91857481. The reversal of 91857473 is 37475819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79691329 + 12166144 = 8927^2 + 3488^2 .

It is a cyclic number.

It is not a de Polignac number, because 91857473 - 2¹⁰ = 91856449 is a prime.

It is not a weakly prime, because it can be changed into another prime (91857673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45928736 + 45928737.

It is an arithmetic number, because the mean of its divisors is an integer number (45928737).

Almost surely, 2^91857473 is an apocalyptic number.

It is an amenable number.

91857473 is a deficient number, since it is larger than the sum of its proper divisors (1).

91857473 is an equidigital number, since it uses as much as digits as its factorization.

91857473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 91857473 is about 9584.2304333734. The cubic root of 91857473 is about 451.2025006594.

The spelling of 91857473 in words is "ninety-one million, eight hundred fifty-seven thousand, four hundred seventy-three".