85991957 has 2 divisors, whose sum is σ = 85991958. Its totient is φ = 85991956.

The previous prime is 85991897. The next prime is 85991977. The reversal of 85991957 is 75919958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48916036 + 37075921 = 6994^2 + 6089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85991957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85991899 and 85991908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85991977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42995978 + 42995979.

It is an arithmetic number, because the mean of its divisors is an integer number (42995979).

Almost surely, 2^85991957 is an apocalyptic number.

It is an amenable number.

85991957 is a deficient number, since it is larger than the sum of its proper divisors (1).

85991957 is an equidigital number, since it uses as much as digits as its factorization.

85991957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 53.

The square root of 85991957 is about 9273.1848358587. The cubic root of 85991957 is about 441.3867354114.

The spelling of 85991957 in words is "eighty-five million, nine hundred ninety-one thousand, nine hundred fifty-seven".