622721631 has 32 divisors (see below), whose sum is σ = 960680448. Its totient is φ = 351457920.

The previous prime is 622721629. The next prime is 622721633. The reversal of 622721631 is 136127226.

It is an interprime number because it is at equal distance from previous prime (622721629) and next prime (622721633).

It is not a de Polignac number, because 622721631 - 2¹ = 622721629 is a prime.

It is a super-2 number, since 2×622721631² = 775564459430600322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622721633) 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 31 ways as a sum of consecutive naturals, for example, 657100 + ... + 658046.

It is an arithmetic number, because the mean of its divisors is an integer number (30021264).

Almost surely, 2^622721631 is an apocalyptic number.

622721631 is a deficient number, since it is larger than the sum of its proper divisors (337958817).

622721631 is a wasteful number, since it uses less digits than its factorization.

622721631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its digits is 6048, while the sum is 30.

The square root of 622721631 is about 24954.3910164123. The cubic root of 622721631 is about 853.9477867004.

Adding to 622721631 its reverse (136127226), we get a palindrome (758848857).

It can be divided in two parts, 62272 and 1631, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 622721631 in words is "six hundred twenty-two million, seven hundred twenty-one thousand, six hundred thirty-one".