85177231 has 2 divisors, whose sum is σ = 85177232. Its totient is φ = 85177230.

The previous prime is 85177229. The next prime is 85177241. The reversal of 85177231 is 13277158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85177231 - 2¹ = 85177229 is a prime.

It is a super-2 number, since 2×85177231² = 14510321361654722, which contains 22 as substring.

Together with 85177229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85177241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42588615 + 42588616.

It is an arithmetic number, because the mean of its divisors is an integer number (42588616).

Almost surely, 2^85177231 is an apocalyptic number.

85177231 is a deficient number, since it is larger than the sum of its proper divisors (1).

85177231 is an equidigital number, since it uses as much as digits as its factorization.

85177231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 85177231 is about 9229.1511527334. The cubic root of 85177231 is about 439.9883450770.

The spelling of 85177231 in words is "eighty-five million, one hundred seventy-seven thousand, two hundred thirty-one".