621513349 has 4 divisors (see below), whose sum is σ = 621607660. Its totient is φ = 621419040.

The previous prime is 621513317. The next prime is 621513359. The reversal of 621513349 is 943315126.

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 480924900 + 140588449 = 21930^2 + 11857^2 .

It is a cyclic number.

It is not a de Polignac number, because 621513349 - 2⁵ = 621513317 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 (621513359) 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, 36462 + ... + 50719.

It is an arithmetic number, because the mean of its divisors is an integer number (155401915).

Almost surely, 2^621513349 is an apocalyptic number.

It is an amenable number.

621513349 is a deficient number, since it is larger than the sum of its proper divisors (94311).

621513349 is an equidigital number, since it uses as much as digits as its factorization.

621513349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94310.

The product of its digits is 19440, while the sum is 34.

The square root of 621513349 is about 24930.1694538966. The cubic root of 621513349 is about 853.3951171730.

The spelling of 621513349 in words is "six hundred twenty-one million, five hundred thirteen thousand, three hundred forty-nine".