85777231 has 2 divisors, whose sum is σ = 85777232. Its totient is φ = 85777230.

The previous prime is 85777199. The next prime is 85777243. The reversal of 85777231 is 13277758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85777231 - 2⁵ = 85777199 is a prime.

It is a super-2 number, since 2×85777231² = 14715466716054722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85772231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42888615 + 42888616.

It is an arithmetic number, because the mean of its divisors is an integer number (42888616).

Almost surely, 2^85777231 is an apocalyptic number.

85777231 is a deficient number, since it is larger than the sum of its proper divisors (1).

85777231 is an equidigital number, since it uses as much as digits as its factorization.

85777231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 85777231 is about 9261.5998078086. The cubic root of 85777231 is about 441.0190413122.

The spelling of 85777231 in words is "eighty-five million, seven hundred seventy-seven thousand, two hundred thirty-one".