621052651 has 4 divisors (see below), whose sum is σ = 631233904. Its totient is φ = 610871400.

The previous prime is 621052637. The next prime is 621052709. The reversal of 621052651 is 156250126.

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

It is a cyclic number.

It is not a de Polignac number, because 621052651 - 2¹¹ = 621050603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621055651) 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, 5090535 + ... + 5090656.

It is an arithmetic number, because the mean of its divisors is an integer number (157808476).

Almost surely, 2^621052651 is an apocalyptic number.

621052651 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

621052651 is a deficient number, since it is larger than the sum of its proper divisors (10181253).

621052651 is a wasteful number, since it uses less digits than its factorization.

621052651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10181252.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 621052651 is about 24920.9279722887. The cubic root of 621052651 is about 853.1842047782.

The spelling of 621052651 in words is "six hundred twenty-one million, fifty-two thousand, six hundred fifty-one".