621621247 has 16 divisors (see below), whose sum is σ = 678500032. Its totient is φ = 566092800.

The previous prime is 621621199. The next prime is 621621257. The reversal of 621621247 is 742126126.

It is a de Polignac number, because none of the positive numbers 2^k-621621247 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 (621621257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307183 + ... + 309199.

It is an arithmetic number, because the mean of its divisors is an integer number (42406252).

Almost surely, 2^621621247 is an apocalyptic number.

621621247 is a deficient number, since it is larger than the sum of its proper divisors (56878785).

621621247 is a wasteful number, since it uses less digits than its factorization.

621621247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

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

The square root of 621621247 is about 24932.3333645289. Note that the first 4 decimals coincide. The cubic root of 621621247 is about 853.4444989487. Note that the first 4 decimals are identical.

The spelling of 621621247 in words is "six hundred twenty-one million, six hundred twenty-one thousand, two hundred forty-seven".