91445983 has 2 divisors, whose sum is σ = 91445984. Its totient is φ = 91445982.

The previous prime is 91445971. The next prime is 91446007. The reversal of 91445983 is 38954419.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91445983 - 2¹³ = 91437791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91445183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45722991 + 45722992.

It is an arithmetic number, because the mean of its divisors is an integer number (45722992).

Almost surely, 2^91445983 is an apocalyptic number.

91445983 is a deficient number, since it is larger than the sum of its proper divisors (1).

91445983 is an equidigital number, since it uses as much as digits as its factorization.

91445983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 91445983 is about 9562.7393041952. The cubic root of 91445983 is about 450.5277479077.

The spelling of 91445983 in words is "ninety-one million, four hundred forty-five thousand, nine hundred eighty-three".