621062009 has 2 divisors, whose sum is σ = 621062010. Its totient is φ = 621062008.

The previous prime is 621061951. The next prime is 621062023. The reversal of 621062009 is 900260126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562875625 + 58186384 = 23725^2 + 7628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621062009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621062069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310531004 + 310531005.

It is an arithmetic number, because the mean of its divisors is an integer number (310531005).

Almost surely, 2^621062009 is an apocalyptic number.

It is an amenable number.

621062009 is a deficient number, since it is larger than the sum of its proper divisors (1).

621062009 is an equidigital number, since it uses as much as digits as its factorization.

621062009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 621062009 is about 24921.1157254245. The cubic root of 621062009 is about 853.1884900067.

The spelling of 621062009 in words is "six hundred twenty-one million, sixty-two thousand, nine".