621143445 has 48 divisors (see below), whose sum is σ = 1094662080. Its totient is φ = 300538368.

The previous prime is 621143437. The next prime is 621143449. The reversal of 621143445 is 544341126.

It is not a de Polignac number, because 621143445 - 2³ = 621143437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621143449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147489 + ... + 151641.

It is an arithmetic number, because the mean of its divisors is an integer number (22805460).

Almost surely, 2^621143445 is an apocalyptic number.

621143445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

621143445 is a deficient number, since it is larger than the sum of its proper divisors (473518635).

621143445 is a wasteful number, since it uses less digits than its factorization.

621143445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246 (or 4233 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 621143445 is about 24922.7495473513. The cubic root of 621143445 is about 853.2257794777.

The spelling of 621143445 in words is "six hundred twenty-one million, one hundred forty-three thousand, four hundred forty-five".