645112631 has 2 divisors, whose sum is σ = 645112632. Its totient is φ = 645112630.

The previous prime is 645112621. The next prime is 645112679. The reversal of 645112631 is 136211546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645112631 - 2¹⁴ = 645096247 is a prime.

It is a super-2 number, since 2×645112631² = 832340613351484322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645112594 and 645112603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645112621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322556315 + 322556316.

It is an arithmetic number, because the mean of its divisors is an integer number (322556316).

Almost surely, 2^645112631 is an apocalyptic number.

645112631 is a deficient number, since it is larger than the sum of its proper divisors (1).

645112631 is an equidigital number, since it uses as much as digits as its factorization.

645112631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 645112631 is about 25399.0675222536. The cubic root of 645112631 is about 864.0625486089.

The spelling of 645112631 in words is "six hundred forty-five million, one hundred twelve thousand, six hundred thirty-one".