85177979 has 2 divisors, whose sum is σ = 85177980. Its totient is φ = 85177978.

The previous prime is 85177921. The next prime is 85177997. The reversal of 85177979 is 97977158.

Together with next prime (85177997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85177979 - 2²⁰ = 84129403 is a prime.

It is a super-3 number, since 3×85177979³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85177979.

It is not a weakly prime, because it can be changed into another prime (85177909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42588989 + 42588990.

It is an arithmetic number, because the mean of its divisors is an integer number (42588990).

Almost surely, 2^85177979 is an apocalyptic number.

85177979 is a deficient number, since it is larger than the sum of its proper divisors (1).

85177979 is an equidigital number, since it uses as much as digits as its factorization.

85177979 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 85177979 is about 9229.1916764146. The cubic root of 85177979 is about 439.9896330202.

The spelling of 85177979 in words is "eighty-five million, one hundred seventy-seven thousand, nine hundred seventy-nine".