85011631 has 2 divisors, whose sum is σ = 85011632. Its totient is φ = 85011630.

The previous prime is 85011623. The next prime is 85011649. The reversal of 85011631 is 13611058.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85011631 - 2³ = 85011623 is a prime.

It is a super-2 number, since 2×85011631² = 14453954810560322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85011596 and 85011605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85011691) 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, 42505815 + 42505816.

It is an arithmetic number, because the mean of its divisors is an integer number (42505816).

Almost surely, 2^85011631 is an apocalyptic number.

85011631 is a deficient number, since it is larger than the sum of its proper divisors (1).

85011631 is an equidigital number, since it uses as much as digits as its factorization.

85011631 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 25.

The square root of 85011631 is about 9220.1752152549. The cubic root of 85011631 is about 439.7030210172.

Adding to 85011631 its reverse (13611058), we get a palindrome (98622689).

The spelling of 85011631 in words is "eighty-five million, eleven thousand, six hundred thirty-one".