91713889 has 2 divisors, whose sum is σ = 91713890. Its totient is φ = 91713888.

The previous prime is 91713871. The next prime is 91713911. The reversal of 91713889 is 98831719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59166864 + 32547025 = 7692^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 91713889 - 2¹³ = 91705697 is a prime.

It is a super-2 number, since 2×91713889² = 16822874871008642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91713829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45856944 + 45856945.

It is an arithmetic number, because the mean of its divisors is an integer number (45856945).

Almost surely, 2^91713889 is an apocalyptic number.

It is an amenable number.

91713889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91713889 is an equidigital number, since it uses as much as digits as its factorization.

91713889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 91713889 is about 9576.7368659685. The cubic root of 91713889 is about 450.9672839233.

The spelling of 91713889 in words is "ninety-one million, seven hundred thirteen thousand, eight hundred eighty-nine".