670520913 has 4 divisors (see below), whose sum is σ = 894027888. Its totient is φ = 447013940.

The previous prime is 670520897. The next prime is 670520969. The reversal of 670520913 is 319025076.

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 670520913 - 2⁴ = 670520897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (670520713) 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, 111753483 + ... + 111753488.

It is an arithmetic number, because the mean of its divisors is an integer number (223506972).

Almost surely, 2^670520913 is an apocalyptic number.

It is an amenable number.

670520913 is a deficient number, since it is larger than the sum of its proper divisors (223506975).

670520913 is a wasteful number, since it uses less digits than its factorization.

670520913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223506974.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 670520913 is about 25894.4185684869. The cubic root of 670520913 is about 875.2607279618.

Adding to 670520913 its reverse (319025076), we get a palindrome (989545989).

The spelling of 670520913 in words is "six hundred seventy million, five hundred twenty thousand, nine hundred thirteen".