625631311 has 4 divisors (see below), whose sum is σ = 635887624. Its totient is φ = 615375000.

The previous prime is 625631299. The next prime is 625631317. The reversal of 625631311 is 113136526.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 625631311 - 2¹⁵ = 625598543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 625631311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625631317) 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 in 3 ways as a sum of consecutive naturals, for example, 5128065 + ... + 5128186.

It is an arithmetic number, because the mean of its divisors is an integer number (158971906).

Almost surely, 2^625631311 is an apocalyptic number.

625631311 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

625631311 is a deficient number, since it is larger than the sum of its proper divisors (10256313).

625631311 is a wasteful number, since it uses less digits than its factorization.

625631311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10256312.

The product of its digits is 3240, while the sum is 28.

The square root of 625631311 is about 25012.6230331807. The cubic root of 625631311 is about 855.2757502325.

Adding to 625631311 its reverse (113136526), we get a palindrome (738767837).

The spelling of 625631311 in words is "six hundred twenty-five million, six hundred thirty-one thousand, three hundred eleven".