91146989 has 2 divisors, whose sum is σ = 91146990. Its totient is φ = 91146988.

The previous prime is 91146983. The next prime is 91147003. The reversal of 91146989 is 98964119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86174089 + 4972900 = 9283^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 91146989 - 2⁴ = 91146973 is a prime.

It is a super-2 number, since 2×91146989² = 16615547207532242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91146983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45573494 + 45573495.

It is an arithmetic number, because the mean of its divisors is an integer number (45573495).

Almost surely, 2^91146989 is an apocalyptic number.

It is an amenable number.

91146989 is a deficient number, since it is larger than the sum of its proper divisors (1).

91146989 is an equidigital number, since it uses as much as digits as its factorization.

91146989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 91146989 is about 9547.0932225469. The cubic root of 91146989 is about 450.0361929737.

The spelling of 91146989 in words is "ninety-one million, one hundred forty-six thousand, nine hundred eighty-nine".