622345921 has 4 divisors (see below), whose sum is σ = 622395844. Its totient is φ = 622296000.

The previous prime is 622345907. The next prime is 622345949. The reversal of 622345921 is 129543226.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 129543226 = 2 ⋅64771613.

It can be written as a sum of positive squares in 2 ways, for example, as 248503696 + 373842225 = 15764^2 + 19335^2 .

It is a cyclic number.

It is not a de Polignac number, because 622345921 - 2¹⁷ = 622214849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622345961) 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, 11221 + ... + 37021.

It is an arithmetic number, because the mean of its divisors is an integer number (155598961).

Almost surely, 2^622345921 is an apocalyptic number.

It is an amenable number.

622345921 is a deficient number, since it is larger than the sum of its proper divisors (49923).

622345921 is a wasteful number, since it uses less digits than its factorization.

622345921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49922.

The product of its digits is 25920, while the sum is 34.

The square root of 622345921 is about 24946.8619469464. The cubic root of 622345921 is about 853.7760131756.

The spelling of 622345921 in words is "six hundred twenty-two million, three hundred forty-five thousand, nine hundred twenty-one".