621912349 has 4 divisors (see below), whose sum is σ = 622951200. Its totient is φ = 620873500.

The previous prime is 621912301. The next prime is 621912371. The reversal of 621912349 is 943219126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621912349 - 2¹¹ = 621910301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621912749) 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, 518527 + ... + 519724.

It is an arithmetic number, because the mean of its divisors is an integer number (155737800).

Almost surely, 2^621912349 is an apocalyptic number.

It is an amenable number.

621912349 is a deficient number, since it is larger than the sum of its proper divisors (1038851).

621912349 is a wasteful number, since it uses less digits than its factorization.

621912349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038850.

The product of its digits is 23328, while the sum is 37.

The square root of 621912349 is about 24938.1705223138. The cubic root of 621912349 is about 853.5776993666.

The spelling of 621912349 in words is "six hundred twenty-one million, nine hundred twelve thousand, three hundred forty-nine".