621981459 has 24 divisors (see below), whose sum is σ = 980987904. Its totient is φ = 376614000.

The previous prime is 621981449. The next prime is 621981461. The reversal of 621981459 is 954189126.

621981459 is a `hidden beast` number, since 6 + 2 + 198 + 1 + 459 = 666.

It is not a de Polignac number, because 621981459 - 2⁴ = 621981443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621981449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143494 + ... + 147764.

It is an arithmetic number, because the mean of its divisors is an integer number (40874496).

Almost surely, 2^621981459 is an apocalyptic number.

621981459 is a deficient number, since it is larger than the sum of its proper divisors (359006445).

621981459 is a wasteful number, since it uses less digits than its factorization.

621981459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759 (or 5756 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 621981459 is about 24939.5561107250. The cubic root of 621981459 is about 853.6093161317.

It can be divided in two parts, 6219 and 81459, that added together give a palindrome (87678).

The spelling of 621981459 in words is "six hundred twenty-one million, nine hundred eighty-one thousand, four hundred fifty-nine".