91375397 has 2 divisors, whose sum is σ = 91375398. Its totient is φ = 91375396.

The previous prime is 91375393. The next prime is 91375409. The reversal of 91375397 is 79357319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61246276 + 30129121 = 7826^2 + 5489^2 .

It is a cyclic number.

It is not a de Polignac number, because 91375397 - 2² = 91375393 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91375393) 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, 45687698 + 45687699.

It is an arithmetic number, because the mean of its divisors is an integer number (45687699).

Almost surely, 2^91375397 is an apocalyptic number.

It is an amenable number.

91375397 is a deficient number, since it is larger than the sum of its proper divisors (1).

91375397 is an equidigital number, since it uses as much as digits as its factorization.

91375397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 178605, while the sum is 44.

The square root of 91375397 is about 9559.0479128415. The cubic root of 91375397 is about 450.4117991755.

The spelling of 91375397 in words is "ninety-one million, three hundred seventy-five thousand, three hundred ninety-seven".