2251660309 has 2 divisors, whose sum is σ = 2251660310. Its totient is φ = 2251660308.

The previous prime is 2251660297. The next prime is 2251660331. The reversal of 2251660309 is 9030661522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361831409 + 889828900 = 36903^2 + 29830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251660309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2251660009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125830154 + 1125830155.

It is an arithmetic number, because the mean of its divisors is an integer number (1125830155).

Almost surely, 2^2251660309 is an apocalyptic number.

It is an amenable number.

2251660309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251660309 is an equidigital number, since it uses as much as digits as its factorization.

2251660309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 2251660309 is about 47451.6628686498. The cubic root of 2251660309 is about 1310.6929319696.

The spelling of 2251660309 in words is "two billion, two hundred fifty-one million, six hundred sixty thousand, three hundred nine".