621426541 has 4 divisors (see below), whose sum is σ = 630701632. Its totient is φ = 612151452.

The previous prime is 621426499. The next prime is 621426557. The reversal of 621426541 is 145624126.

It is a happy number.

621426541 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145624126 = 2 ⋅72812063.

It is a cyclic number.

It is not a de Polignac number, because 621426541 - 2¹¹ = 621424493 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 (621426571) 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, 4637445 + ... + 4637578.

It is an arithmetic number, because the mean of its divisors is an integer number (157675408).

Almost surely, 2^621426541 is an apocalyptic number.

It is an amenable number.

621426541 is a deficient number, since it is larger than the sum of its proper divisors (9275091).

621426541 is an equidigital number, since it uses as much as digits as its factorization.

621426541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275090.

The product of its digits is 11520, while the sum is 31.

The square root of 621426541 is about 24928.4283700357. The cubic root of 621426541 is about 853.3553835278.

The spelling of 621426541 in words is "six hundred twenty-one million, four hundred twenty-six thousand, five hundred forty-one".