621422717 has 4 divisors (see below), whose sum is σ = 648441120. Its totient is φ = 594404316.

The previous prime is 621422693. The next prime is 621422731. The reversal of 621422717 is 717224126.

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 621422717 - 2²⁶ = 554313853 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 (621422017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13509167 + ... + 13509212.

It is an arithmetic number, because the mean of its divisors is an integer number (162110280).

Almost surely, 2^621422717 is an apocalyptic number.

It is an amenable number.

621422717 is a deficient number, since it is larger than the sum of its proper divisors (27018403).

621422717 is a wasteful number, since it uses less digits than its factorization.

621422717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27018402.

The product of its digits is 9408, while the sum is 32.

The square root of 621422717 is about 24928.3516703371. The cubic root of 621422717 is about 853.3536331264.

The spelling of 621422717 in words is "six hundred twenty-one million, four hundred twenty-two thousand, seven hundred seventeen".