621145379 has 4 divisors (see below), whose sum is σ = 626950584. Its totient is φ = 615340176.

The previous prime is 621145351. The next prime is 621145411. The reversal of 621145379 is 973541126.

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 621145379 - 2⁸ = 621145123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621145309) 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, 2902442 + ... + 2902655.

It is an arithmetic number, because the mean of its divisors is an integer number (156737646).

Almost surely, 2^621145379 is an apocalyptic number.

621145379 is a deficient number, since it is larger than the sum of its proper divisors (5805205).

621145379 is a wasteful number, since it uses less digits than its factorization.

621145379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5805204.

The product of its digits is 45360, while the sum is 38.

The square root of 621145379 is about 24922.7883472135. The cubic root of 621145379 is about 853.2266650149.

The spelling of 621145379 in words is "six hundred twenty-one million, one hundred forty-five thousand, three hundred seventy-nine".