85621213631 has 2 divisors, whose sum is σ = 85621213632. Its totient is φ = 85621213630.

The previous prime is 85621213627. The next prime is 85621213651. The reversal of 85621213631 is 13631212658.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85621213631 - 2² = 85621213627 is a prime.

It is a super-2 number, since 2×85621213631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85621213651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810606815 + 42810606816.

It is an arithmetic number, because the mean of its divisors is an integer number (42810606816).

Almost surely, 2^85621213631 is an apocalyptic number.

85621213631 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621213631 is an equidigital number, since it uses as much as digits as its factorization.

85621213631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The spelling of 85621213631 in words is "eighty-five billion, six hundred twenty-one million, two hundred thirteen thousand, six hundred thirty-one".