83891597 has 2 divisors, whose sum is σ = 83891598. Its totient is φ = 83891596.

The previous prime is 83891551. The next prime is 83891623. The reversal of 83891597 is 79519838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 24462916 = 7709^2 + 4946^2 .

It is a cyclic number.

It is not a de Polignac number, because 83891597 - 2⁸ = 83891341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83893597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41945798 + 41945799.

It is an arithmetic number, because the mean of its divisors is an integer number (41945799).

Almost surely, 2^83891597 is an apocalyptic number.

It is an amenable number.

83891597 is a deficient number, since it is larger than the sum of its proper divisors (1).

83891597 is an equidigital number, since it uses as much as digits as its factorization.

83891597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 50.

The square root of 83891597 is about 9159.2356122113. The cubic root of 83891597 is about 437.7634388361.

The spelling of 83891597 in words is "eighty-three million, eight hundred ninety-one thousand, five hundred ninety-seven".