2009366857 has 2 divisors, whose sum is σ = 2009366858. Its totient is φ = 2009366856.

The previous prime is 2009366813. The next prime is 2009366873. The reversal of 2009366857 is 7586639002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1976602681 + 32764176 = 44459^2 + 5724^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009366857 - 2¹⁹ = 2008842569 is a prime.

It is not a weakly prime, because it can be changed into another prime (2009366057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004683428 + 1004683429.

It is an arithmetic number, because the mean of its divisors is an integer number (1004683429).

Almost surely, 2^2009366857 is an apocalyptic number.

It is an amenable number.

2009366857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009366857 is an equidigital number, since it uses as much as digits as its factorization.

2009366857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 2009366857 is about 44825.9618636343. The cubic root of 2009366857 is about 1261.8849039392.

The spelling of 2009366857 in words is "two billion, nine million, three hundred sixty-six thousand, eight hundred fifty-seven".