91377997 has 2 divisors, whose sum is σ = 91377998. Its totient is φ = 91377996.

The previous prime is 91377983. The next prime is 91378019. The reversal of 91377997 is 79977319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76370121 + 15007876 = 8739^2 + 3874^2 .

It is a cyclic number.

It is not a de Polignac number, because 91377997 - 2¹⁵ = 91345229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91377947) 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, 45688998 + 45688999.

It is an arithmetic number, because the mean of its divisors is an integer number (45688999).

Almost surely, 2^91377997 is an apocalyptic number.

It is an amenable number.

91377997 is a deficient number, since it is larger than the sum of its proper divisors (1).

91377997 is an equidigital number, since it uses as much as digits as its factorization.

91377997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750141, while the sum is 52.

The square root of 91377997 is about 9559.1839086817. The cubic root of 91377997 is about 450.4160711481.

The spelling of 91377997 in words is "ninety-one million, three hundred seventy-seven thousand, nine hundred ninety-seven".