621567713 has 4 divisors (see below), whose sum is σ = 669380628. Its totient is φ = 573754800.

The previous prime is 621567707. The next prime is 621567733. The reversal of 621567713 is 317765126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131033809 + 490533904 = 11447^2 + 22148^2 .

It is a cyclic number.

It is not a de Polignac number, because 621567713 - 2⁴ = 621567697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621567703) 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, 23906438 + ... + 23906463.

It is an arithmetic number, because the mean of its divisors is an integer number (167345157).

Almost surely, 2^621567713 is an apocalyptic number.

It is an amenable number.

621567713 is a deficient number, since it is larger than the sum of its proper divisors (47812915).

621567713 is a wasteful number, since it uses less digits than its factorization.

621567713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47812914.

The product of its digits is 52920, while the sum is 38.

The square root of 621567713 is about 24931.2597555759. The cubic root of 621567713 is about 853.4199987086.

The spelling of 621567713 in words is "six hundred twenty-one million, five hundred sixty-seven thousand, seven hundred thirteen".