2909381257 has 2 divisors, whose sum is σ = 2909381258. Its totient is φ = 2909381256.

The previous prime is 2909381243. The next prime is 2909381317. The reversal of 2909381257 is 7521839092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2790374976 + 119006281 = 52824^2 + 10909^2 .

It is a cyclic number.

It is not a de Polignac number, because 2909381257 - 2¹⁵ = 2909348489 is a prime.

It is not a weakly prime, because it can be changed into another prime (2909385257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1454690628 + 1454690629.

It is an arithmetic number, because the mean of its divisors is an integer number (1454690629).

Almost surely, 2^2909381257 is an apocalyptic number.

It is an amenable number.

2909381257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2909381257 is an equidigital number, since it uses as much as digits as its factorization.

2909381257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 2909381257 is about 53938.6805270578. The cubic root of 2909381257 is about 1427.5792020244.

The spelling of 2909381257 in words is "two billion, nine hundred nine million, three hundred eighty-one thousand, two hundred fifty-seven".