91944161 has 2 divisors, whose sum is σ = 91944162. Its totient is φ = 91944160.

The previous prime is 91944131. The next prime is 91944197. The reversal of 91944161 is 16144919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 12645136 = 8905^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 91944161 - 2²⁶ = 24835297 is a prime.

It is not a weakly prime, because it can be changed into another prime (91944101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45972080 + 45972081.

It is an arithmetic number, because the mean of its divisors is an integer number (45972081).

Almost surely, 2^91944161 is an apocalyptic number.

It is an amenable number.

91944161 is a deficient number, since it is larger than the sum of its proper divisors (1).

91944161 is an equidigital number, since it uses as much as digits as its factorization.

91944161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 91944161 is about 9588.7517957240. The cubic root of 91944161 is about 451.3443927427.

The spelling of 91944161 in words is "ninety-one million, nine hundred forty-four thousand, one hundred sixty-one".