630913 has 4 divisors (see below), whose sum is σ = 658368. Its totient is φ = 603460.

The previous prime is 630911. The next prime is 630919. The reversal of 630913 is 319036.

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 not a de Polignac number, because 630913 - 2¹ = 630911 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630911) 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, 13693 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (164592).

2⁶³⁰⁹¹³ is an apocalyptic number.

It is an amenable number.

630913 is a deficient number, since it is larger than the sum of its proper divisors (27455).

630913 is a wasteful number, since it uses less digits than its factorization.

630913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27454.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 630913 is about 794.3003210373. The cubic root of 630913 is about 85.7675804803.

Adding to 630913 its reverse (319036), we get a palindrome (949949).

The spelling of 630913 in words is "six hundred thirty thousand, nine hundred thirteen".