2009451109 has 2 divisors, whose sum is σ = 2009451110. Its totient is φ = 2009451108.

The previous prime is 2009451107. The next prime is 2009451149. The reversal of 2009451109 is 9011549002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1994069025 + 15382084 = 44655^2 + 3922^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009451109 - 2¹ = 2009451107 is a prime.

It is a super-2 number, since 2×2009451109² = 8075787518922659762, which contains 22 as substring.

Together with 2009451107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009451107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004725554 + 1004725555.

It is an arithmetic number, because the mean of its divisors is an integer number (1004725555).

Almost surely, 2^2009451109 is an apocalyptic number.

It is an amenable number.

2009451109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009451109 is an equidigital number, since it uses as much as digits as its factorization.

2009451109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 2009451109 is about 44826.9016216825. The cubic root of 2009451109 is about 1261.9025404799.

The spelling of 2009451109 in words is "two billion, nine million, four hundred fifty-one thousand, one hundred nine".