1298904989 has 2 divisors, whose sum is σ = 1298904990. Its totient is φ = 1298904988.

The previous prime is 1298904979. The next prime is 1298905021. The reversal of 1298904989 is 9894098921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743925625 + 554979364 = 27275^2 + 23558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1298904989 - 2²⁴ = 1282127773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1298904979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649452494 + 649452495.

It is an arithmetic number, because the mean of its divisors is an integer number (649452495).

Almost surely, 2^1298904989 is an apocalyptic number.

It is an amenable number.

1298904989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298904989 is an equidigital number, since it uses as much as digits as its factorization.

1298904989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 59.

The square root of 1298904989 is about 36040.3244852207. The cubic root of 1298904989 is about 1091.0863643646.

The spelling of 1298904989 in words is "one billion, two hundred ninety-eight million, nine hundred four thousand, nine hundred eighty-nine".