91855493 has 2 divisors, whose sum is σ = 91855494. Its totient is φ = 91855492.

The previous prime is 91855487. The next prime is 91855523. The reversal of 91855493 is 39455819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62457409 + 29398084 = 7903^2 + 5422^2 .

It is a cyclic number.

It is not a de Polignac number, because 91855493 - 2¹⁴ = 91839109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91855453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45927746 + 45927747.

It is an arithmetic number, because the mean of its divisors is an integer number (45927747).

Almost surely, 2^91855493 is an apocalyptic number.

It is an amenable number.

91855493 is a deficient number, since it is larger than the sum of its proper divisors (1).

91855493 is an equidigital number, since it uses as much as digits as its factorization.

91855493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 91855493 is about 9584.1271381384. The cubic root of 91855493 is about 451.1992587262.

The spelling of 91855493 in words is "ninety-one million, eight hundred fifty-five thousand, four hundred ninety-three".