621132443 has 4 divisors (see below), whose sum is σ = 621372048. Its totient is φ = 620892840.

The previous prime is 621132403. The next prime is 621132487. The reversal of 621132443 is 344231126.

621132443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621132443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621132403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115871 + ... + 121112.

It is an arithmetic number, because the mean of its divisors is an integer number (155343012).

Almost surely, 2^621132443 is an apocalyptic number.

621132443 is a deficient number, since it is larger than the sum of its proper divisors (239605).

621132443 is a wasteful number, since it uses less digits than its factorization.

621132443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239604.

The product of its digits is 3456, while the sum is 26.

The square root of 621132443 is about 24922.5288243388. The cubic root of 621132443 is about 853.2207418622.

Adding to 621132443 its reverse (344231126), we get a palindrome (965363569).

The spelling of 621132443 in words is "six hundred twenty-one million, one hundred thirty-two thousand, four hundred forty-three".