85156031 has 2 divisors, whose sum is σ = 85156032. Its totient is φ = 85156030.

The previous prime is 85156021. The next prime is 85156067. The reversal of 85156031 is 13065158.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85156031 is a prime.

It is a super-3 number, since 3×85156031³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 85155985 and 85156003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85156021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42578015 + 42578016.

It is an arithmetic number, because the mean of its divisors is an integer number (42578016).

Almost surely, 2^85156031 is an apocalyptic number.

85156031 is a deficient number, since it is larger than the sum of its proper divisors (1).

85156031 is an equidigital number, since it uses as much as digits as its factorization.

85156031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 85156031 is about 9228.0025465970. The cubic root of 85156031 is about 439.9518387368.

The spelling of 85156031 in words is "eighty-five million, one hundred fifty-six thousand, thirty-one".