625537813 has 4 divisors (see below), whose sum is σ = 640085248. Its totient is φ = 610990380.

The previous prime is 625537793. The next prime is 625537841. The reversal of 625537813 is 318735526.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625537813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625537613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7273653 + ... + 7273738.

It is an arithmetic number, because the mean of its divisors is an integer number (160021312).

Almost surely, 2^625537813 is an apocalyptic number.

It is an amenable number.

625537813 is a deficient number, since it is larger than the sum of its proper divisors (14547435).

625537813 is a wasteful number, since it uses less digits than its factorization.

625537813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14547434.

The product of its digits is 151200, while the sum is 40.

The square root of 625537813 is about 25010.7539470525. The cubic root of 625537813 is about 855.2331423074.

The spelling of 625537813 in words is "six hundred twenty-five million, five hundred thirty-seven thousand, eight hundred thirteen".