2009622521 has 2 divisors, whose sum is σ = 2009622522. Its totient is φ = 2009622520.

The previous prime is 2009622487. The next prime is 2009622557. The reversal of 2009622521 is 1252269002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1244325625 + 765296896 = 35275^2 + 27664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009622521 - 2³⁰ = 935880697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2009622221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004811260 + 1004811261.

It is an arithmetic number, because the mean of its divisors is an integer number (1004811261).

Almost surely, 2^2009622521 is an apocalyptic number.

It is an amenable number.

2009622521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009622521 is an equidigital number, since it uses as much as digits as its factorization.

2009622521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2009622521 is about 44828.8135131859. The cubic root of 2009622521 is about 1261.9384207736.

The spelling of 2009622521 in words is "two billion, nine million, six hundred twenty-two thousand, five hundred twenty-one".