622453981 has 4 divisors (see below), whose sum is σ = 622509472. Its totient is φ = 622398492.

The previous prime is 622453969. The next prime is 622454017. The reversal of 622453981 is 189354226.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-622453981 is a prime.

It is a super-2 number, since 2×622453981² = 774897916925496722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622453901) 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, 4335 + ... + 35548.

It is an arithmetic number, because the mean of its divisors is an integer number (155627368).

Almost surely, 2^622453981 is an apocalyptic number.

It is an amenable number.

622453981 is a deficient number, since it is larger than the sum of its proper divisors (55491).

622453981 is a wasteful number, since it uses less digits than its factorization.

622453981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55490.

The product of its digits is 103680, while the sum is 40.

The square root of 622453981 is about 24949.0276564038. The cubic root of 622453981 is about 853.8254249757.

The spelling of 622453981 in words is "six hundred twenty-two million, four hundred fifty-three thousand, nine hundred eighty-one".