85511731 has 2 divisors, whose sum is σ = 85511732. Its totient is φ = 85511730.

The previous prime is 85511711. The next prime is 85511743. The reversal of 85511731 is 13711558.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85511731 is a prime.

It is a super-2 number, since 2×85511731² = 14624512277232722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85511693 and 85511702.

It is not a weakly prime, because it can be changed into another prime (85511711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42755865 + 42755866.

It is an arithmetic number, because the mean of its divisors is an integer number (42755866).

Almost surely, 2^85511731 is an apocalyptic number.

85511731 is a deficient number, since it is larger than the sum of its proper divisors (1).

85511731 is an equidigital number, since it uses as much as digits as its factorization.

85511731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 31.

The square root of 85511731 is about 9247.2553225268. The cubic root of 85511731 is about 440.5635530295.

The spelling of 85511731 in words is "eighty-five million, five hundred eleven thousand, seven hundred thirty-one".