621740541 has 32 divisors (see below), whose sum is σ = 915235200. Its totient is φ = 373667840.

The previous prime is 621740533. The next prime is 621740543. The reversal of 621740541 is 145047126.

621740541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 621740541 - 2³ = 621740533 is a prime.

It is a super-2 number, since 2×621740541² = 773122600645945362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621740499 and 621740508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621740543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192145 + ... + 195353.

It is an arithmetic number, because the mean of its divisors is an integer number (28601100).

Almost surely, 2^621740541 is an apocalyptic number.

It is an amenable number.

621740541 is a deficient number, since it is larger than the sum of its proper divisors (293494659).

621740541 is a wasteful number, since it uses less digits than its factorization.

621740541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3389.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 621740541 is about 24934.7256050673. The cubic root of 621740541 is about 853.4990896910.

Adding to 621740541 its reverse (145047126), we get a palindrome (766787667).

The spelling of 621740541 in words is "six hundred twenty-one million, seven hundred forty thousand, five hundred forty-one".