621941651 has 4 divisors (see below), whose sum is σ = 658526472. Its totient is φ = 585356832.

The previous prime is 621941603. The next prime is 621941657. The reversal of 621941651 is 156149126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621941651 is a prime.

It is a super-2 number, since 2×621941651² = 773622834497211602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621941657) 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, 18292385 + ... + 18292418.

It is an arithmetic number, because the mean of its divisors is an integer number (164631618).

Almost surely, 2^621941651 is an apocalyptic number.

621941651 is a deficient number, since it is larger than the sum of its proper divisors (36584821).

621941651 is a wasteful number, since it uses less digits than its factorization.

621941651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36584820.

The product of its digits is 12960, while the sum is 35.

The square root of 621941651 is about 24938.7580083692. The cubic root of 621941651 is about 853.5911048682.

The spelling of 621941651 in words is "six hundred twenty-one million, nine hundred forty-one thousand, six hundred fifty-one".