671220013 has 4 divisors (see below), whose sum is σ = 680673888. Its totient is φ = 661766140.

The previous prime is 671220001. The next prime is 671220041. The reversal of 671220013 is 310022176.

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 671220013 - 2¹⁷ = 671088941 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 (671220083) 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, 4726831 + ... + 4726972.

It is an arithmetic number, because the mean of its divisors is an integer number (170168472).

Almost surely, 2^671220013 is an apocalyptic number.

It is an amenable number.

671220013 is a deficient number, since it is larger than the sum of its proper divisors (9453875).

671220013 is an equidigital number, since it uses as much as digits as its factorization.

671220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453874.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 671220013 is about 25907.9140997495. The cubic root of 671220013 is about 875.5648110648.

Adding to 671220013 its reverse (310022176), we get a palindrome (981242189).

The spelling of 671220013 in words is "six hundred seventy-one million, two hundred twenty thousand, thirteen".