1868159849 has 2 divisors, whose sum is σ = 1868159850. Its totient is φ = 1868159848.

The previous prime is 1868159809. The next prime is 1868159879. The reversal of 1868159849 is 9489518681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052029225 + 816130624 = 32435^2 + 28568^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868159849 - 2¹⁶ = 1868094313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1868159809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934079924 + 934079925.

It is an arithmetic number, because the mean of its divisors is an integer number (934079925).

Almost surely, 2^1868159849 is an apocalyptic number.

It is an amenable number.

1868159849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868159849 is an equidigital number, since it uses as much as digits as its factorization.

1868159849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 59.

The square root of 1868159849 is about 43222.2147627814. The cubic root of 1868159849 is about 1231.6047199973.

The spelling of 1868159849 in words is "one billion, eight hundred sixty-eight million, one hundred fifty-nine thousand, eight hundred forty-nine".