621571013 has 4 divisors (see below), whose sum is σ = 710366880. Its totient is φ = 532775148.

The previous prime is 621571003. The next prime is 621571019. The reversal of 621571013 is 310175126.

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 621571013 - 2⁸ = 621570757 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 (621571019) 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, 44397923 + ... + 44397936.

It is an arithmetic number, because the mean of its divisors is an integer number (177591720).

Almost surely, 2^621571013 is an apocalyptic number.

It is an amenable number.

621571013 is a deficient number, since it is larger than the sum of its proper divisors (88795867).

621571013 is an equidigital number, since it uses as much as digits as its factorization.

621571013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88795866.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 621571013 is about 24931.3259374627. The cubic root of 621571013 is about 853.4215090192.

The spelling of 621571013 in words is "six hundred twenty-one million, five hundred seventy-one thousand, thirteen".