622620913 has 4 divisors (see below), whose sum is σ = 623983780. Its totient is φ = 621258048.

The previous prime is 622620857. The next prime is 622620953. The reversal of 622620913 is 319026226.

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 584527329 + 38093584 = 24177^2 + 6172^2 .

It is a cyclic number.

It is not a de Polignac number, because 622620913 - 2¹³ = 622612721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622620953) 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, 680748 + ... + 681661.

It is an arithmetic number, because the mean of its divisors is an integer number (155995945).

Almost surely, 2^622620913 is an apocalyptic number.

It is an amenable number.

622620913 is a deficient number, since it is larger than the sum of its proper divisors (1362867).

622620913 is a wasteful number, since it uses less digits than its factorization.

622620913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362866.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 622620913 is about 24952.3728931739. The cubic root of 622620913 is about 853.9017455020.

The spelling of 622620913 in words is "six hundred twenty-two million, six hundred twenty thousand, nine hundred thirteen".