91810853 has 2 divisors, whose sum is σ = 91810854. Its totient is φ = 91810852.

The previous prime is 91810847. The next prime is 91810879. The reversal of 91810853 is 35801819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67535524 + 24275329 = 8218^2 + 4927^2 .

It is an emirp because it is prime and its reverse (35801819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91810853 - 2¹⁶ = 91745317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91810813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45905426 + 45905427.

It is an arithmetic number, because the mean of its divisors is an integer number (45905427).

Almost surely, 2^91810853 is an apocalyptic number.

It is an amenable number.

91810853 is a deficient number, since it is larger than the sum of its proper divisors (1).

91810853 is an equidigital number, since it uses as much as digits as its factorization.

91810853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 91810853 is about 9581.7980045501. The cubic root of 91810853 is about 451.1261555002.

The spelling of 91810853 in words is "ninety-one million, eight hundred ten thousand, eight hundred fifty-three".