621312403 has 4 divisors (see below), whose sum is σ = 621949320. Its totient is φ = 620675488.

The previous prime is 621312397. The next prime is 621312431. The reversal of 621312403 is 304213126.

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 621312403 - 2⁵ = 621312371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621312493) 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, 316993 + ... + 318946.

It is an arithmetic number, because the mean of its divisors is an integer number (155487330).

Almost surely, 2^621312403 is an apocalyptic number.

621312403 is a deficient number, since it is larger than the sum of its proper divisors (636917).

621312403 is an equidigital number, since it uses as much as digits as its factorization.

621312403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636916.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 621312403 is about 24926.1389509085. The cubic root of 621312403 is about 853.3031347990.

Adding to 621312403 its reverse (304213126), we get a palindrome (925525529).

The spelling of 621312403 in words is "six hundred twenty-one million, three hundred twelve thousand, four hundred three".