621060409 has 4 divisors (see below), whose sum is σ = 621420516. Its totient is φ = 620700304.

The previous prime is 621060361. The next prime is 621060431. The reversal of 621060409 is 904060126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446899600 + 174160809 = 21140^2 + 13197^2 .

It is a cyclic number.

It is not a de Polignac number, because 621060409 - 2²⁵ = 587505977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621060509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177454 + ... + 180919.

It is an arithmetic number, because the mean of its divisors is an integer number (155355129).

Almost surely, 2^621060409 is an apocalyptic number.

It is an amenable number.

621060409 is a deficient number, since it is larger than the sum of its proper divisors (360107).

621060409 is a wasteful number, since it uses less digits than its factorization.

621060409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360106.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 621060409 is about 24921.0836241123. The cubic root of 621060409 is about 853.1877573355.

The spelling of 621060409 in words is "six hundred twenty-one million, sixty thousand, four hundred nine".