621074189 has 2 divisors, whose sum is σ = 621074190. Its totient is φ = 621074188.

The previous prime is 621074183. The next prime is 621074203. The reversal of 621074189 is 981470126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374112964 + 246961225 = 19342^2 + 15715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621074189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621074183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310537094 + 310537095.

It is an arithmetic number, because the mean of its divisors is an integer number (310537095).

Almost surely, 2^621074189 is an apocalyptic number.

It is an amenable number.

621074189 is a deficient number, since it is larger than the sum of its proper divisors (1).

621074189 is an equidigital number, since it uses as much as digits as its factorization.

621074189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 621074189 is about 24921.3600953078. The cubic root of 621074189 is about 853.1940674250.

The spelling of 621074189 in words is "six hundred twenty-one million, seventy-four thousand, one hundred eighty-nine".