85499957 has 2 divisors, whose sum is σ = 85499958. Its totient is φ = 85499956.

The previous prime is 85499941. The next prime is 85499959. The reversal of 85499957 is 75999458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68574961 + 16924996 = 8281^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 85499957 - 2⁴ = 85499941 is a prime.

Together with 85499959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85499959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42749978 + 42749979.

It is an arithmetic number, because the mean of its divisors is an integer number (42749979).

Almost surely, 2^85499957 is an apocalyptic number.

It is an amenable number.

85499957 is a deficient number, since it is larger than the sum of its proper divisors (1).

85499957 is an equidigital number, since it uses as much as digits as its factorization.

85499957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 56.

The square root of 85499957 is about 9246.6186792795. The cubic root of 85499957 is about 440.5433318922.

The spelling of 85499957 in words is "eighty-five million, four hundred ninety-nine thousand, nine hundred fifty-seven".