621633431 has 16 divisors (see below), whose sum is σ = 676552800. Its totient is φ = 569203200.

The previous prime is 621633409. The next prime is 621633451. The reversal of 621633431 is 134336126.

It is a cyclic number.

It is not a de Polignac number, because 621633431 - 2⁶ = 621633367 is a prime.

It is a super-4 number, since 4×621633431⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621633394 and 621633403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621633451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81251 + ... + 88571.

It is an arithmetic number, because the mean of its divisors is an integer number (42284550).

Almost surely, 2^621633431 is an apocalyptic number.

621633431 is a deficient number, since it is larger than the sum of its proper divisors (54919369).

621633431 is a wasteful number, since it uses less digits than its factorization.

621633431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7490.

The product of its digits is 7776, while the sum is 29.

The square root of 621633431 is about 24932.5777046819. The cubic root of 621633431 is about 853.4500748520.

Adding to 621633431 its reverse (134336126), we get a palindrome (755969557).

The spelling of 621633431 in words is "six hundred twenty-one million, six hundred thirty-three thousand, four hundred thirty-one".