91272989 has 2 divisors, whose sum is σ = 91272990. Its totient is φ = 91272988.

The previous prime is 91272931. The next prime is 91273001. The reversal of 91272989 is 98927219.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 43428100 = 6917^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 91272989 - 2⁸ = 91272733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91272089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45636494 + 45636495.

It is an arithmetic number, because the mean of its divisors is an integer number (45636495).

Almost surely, 2^91272989 is an apocalyptic number.

It is an amenable number.

91272989 is a deficient number, since it is larger than the sum of its proper divisors (1).

91272989 is an equidigital number, since it uses as much as digits as its factorization.

91272989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 91272989 is about 9553.6898107485. The cubic root of 91272989 is about 450.2434715387.

The spelling of 91272989 in words is "ninety-one million, two hundred seventy-two thousand, nine hundred eighty-nine".