91379969 has 2 divisors, whose sum is σ = 91379970. Its totient is φ = 91379968.

The previous prime is 91379933. The next prime is 91379983. The reversal of 91379969 is 96997319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90250000 + 1129969 = 9500^2 + 1063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91379969 is a prime.

It is a super-2 number, since 2×91379969² = 16700597468881922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91379969.

It is not a weakly prime, because it can be changed into another prime (91370969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45689984 + 45689985.

It is an arithmetic number, because the mean of its divisors is an integer number (45689985).

Almost surely, 2^91379969 is an apocalyptic number.

It is an amenable number.

91379969 is a deficient number, since it is larger than the sum of its proper divisors (1).

91379969 is an equidigital number, since it uses as much as digits as its factorization.

91379969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 53.

The square root of 91379969 is about 9559.2870550057. The cubic root of 91379969 is about 450.4193112209.

The spelling of 91379969 in words is "ninety-one million, three hundred seventy-nine thousand, nine hundred sixty-nine".