621122647 has 4 divisors (see below), whose sum is σ = 621305776. Its totient is φ = 620939520.

The previous prime is 621122633. The next prime is 621122683. The reversal of 621122647 is 746221126.

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 621122647 - 2⁷ = 621122519 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 (621122627) 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, 86379 + ... + 93292.

It is an arithmetic number, because the mean of its divisors is an integer number (155326444).

Almost surely, 2^621122647 is an apocalyptic number.

621122647 is a deficient number, since it is larger than the sum of its proper divisors (183129).

621122647 is a wasteful number, since it uses less digits than its factorization.

621122647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183128.

The product of its digits is 8064, while the sum is 31.

The square root of 621122647 is about 24922.3322945506. The cubic root of 621122647 is about 853.2162564022.

The spelling of 621122647 in words is "six hundred twenty-one million, one hundred twenty-two thousand, six hundred forty-seven".