1957868009 has 2 divisors, whose sum is σ = 1957868010. Its totient is φ = 1957868008.

The previous prime is 1957867973. The next prime is 1957868047. The reversal of 1957868009 is 9008687591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1868659984 + 89208025 = 43228^2 + 9445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1957868009 - 2²⁴ = 1941090793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1957868069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978934004 + 978934005.

It is an arithmetic number, because the mean of its divisors is an integer number (978934005).

Almost surely, 2^1957868009 is an apocalyptic number.

It is an amenable number.

1957868009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957868009 is an equidigital number, since it uses as much as digits as its factorization.

1957868009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 1957868009 is about 44247.8023070073. The cubic root of 1957868009 is about 1251.0110239640.

The spelling of 1957868009 in words is "one billion, nine hundred fifty-seven million, eight hundred sixty-eight thousand, nine".