85177997 has 2 divisors, whose sum is σ = 85177998. Its totient is φ = 85177996.

The previous prime is 85177979. The next prime is 85178029. The reversal of 85177997 is 79977158.

Together with previous prime (85177979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83704201 + 1473796 = 9149^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 85177997 - 2¹⁴ = 85161613 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 (85170997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42588998 + 42588999.

It is an arithmetic number, because the mean of its divisors is an integer number (42588999).

Almost surely, 2^85177997 is an apocalyptic number.

It is an amenable number.

85177997 is a deficient number, since it is larger than the sum of its proper divisors (1).

85177997 is an equidigital number, since it uses as much as digits as its factorization.

85177997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 53.

The square root of 85177997 is about 9229.1926515812. The cubic root of 85177997 is about 439.9896640134.

The spelling of 85177997 in words is "eighty-five million, one hundred seventy-seven thousand, nine hundred ninety-seven".