621997013 has 16 divisors (see below), whose sum is σ = 694656000. Its totient is φ = 552082800.

The previous prime is 621997007. The next prime is 621997081. The reversal of 621997013 is 310799126.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 621997013 - 2⁸ = 621996757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621993013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256778 + ... + 259188.

It is an arithmetic number, because the mean of its divisors is an integer number (43416000).

Almost surely, 2^621997013 is an apocalyptic number.

It is an amenable number.

621997013 is a deficient number, since it is larger than the sum of its proper divisors (72658987).

621997013 is a wasteful number, since it uses less digits than its factorization.

621997013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 621997013 is about 24939.8679427137. The cubic root of 621997013 is about 853.6164315252.

The spelling of 621997013 in words is "six hundred twenty-one million, nine hundred ninety-seven thousand, thirteen".