1290061889 has 2 divisors, whose sum is σ = 1290061890. Its totient is φ = 1290061888.

The previous prime is 1290061837. The next prime is 1290061909. The reversal of 1290061889 is 9881600921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1090122289 + 199939600 = 33017^2 + 14140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290061889 - 2²⁸ = 1021626433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290061589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645030944 + 645030945.

It is an arithmetic number, because the mean of its divisors is an integer number (645030945).

Almost surely, 2^1290061889 is an apocalyptic number.

It is an amenable number.

1290061889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290061889 is an equidigital number, since it uses as much as digits as its factorization.

1290061889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1290061889 is about 35917.4315479267. The cubic root of 1290061889 is about 1088.6046418503.

The spelling of 1290061889 in words is "one billion, two hundred ninety million, sixty-one thousand, eight hundred eighty-nine".