85213031 has 2 divisors, whose sum is σ = 85213032. Its totient is φ = 85213030.

The previous prime is 85213019. The next prime is 85213097. The reversal of 85213031 is 13031258.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85213031 is a prime.

It is a super-2 number, since 2×85213031² = 14522521304413922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85212988 and 85213006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85213001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42606515 + 42606516.

It is an arithmetic number, because the mean of its divisors is an integer number (42606516).

Almost surely, 2^85213031 is an apocalyptic number.

85213031 is a deficient number, since it is larger than the sum of its proper divisors (1).

85213031 is an equidigital number, since it uses as much as digits as its factorization.

85213031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 85213031 is about 9231.0904556287. The cubic root of 85213031 is about 440.0499788269.

Adding to 85213031 its reverse (13031258), we get a palindrome (98244289).

The spelling of 85213031 in words is "eighty-five million, two hundred thirteen thousand, thirty-one".