91507649 has 2 divisors, whose sum is σ = 91507650. Its totient is φ = 91507648.

The previous prime is 91507631. The next prime is 91507679. The reversal of 91507649 is 94670519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65934400 + 25573249 = 8120^2 + 5057^2 .

It is a cyclic number.

It is not a de Polignac number, because 91507649 - 2⁸ = 91507393 is a prime.

It is not a weakly prime, because it can be changed into another prime (91507679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45753824 + 45753825.

It is an arithmetic number, because the mean of its divisors is an integer number (45753825).

Almost surely, 2^91507649 is an apocalyptic number.

It is an amenable number.

91507649 is a deficient number, since it is larger than the sum of its proper divisors (1).

91507649 is an equidigital number, since it uses as much as digits as its factorization.

91507649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 91507649 is about 9565.9630461339. The cubic root of 91507649 is about 450.6289952984.

The spelling of 91507649 in words is "ninety-one million, five hundred seven thousand, six hundred forty-nine".