1260939989 has 2 divisors, whose sum is σ = 1260939990. Its totient is φ = 1260939988.

The previous prime is 1260939949. The next prime is 1260939991. The reversal of 1260939989 is 9899390621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786353764 + 474586225 = 28042^2 + 21785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1260939989 is a prime.

It is a Sophie Germain prime.

Together with 1260939991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1260939949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630469994 + 630469995.

It is an arithmetic number, because the mean of its divisors is an integer number (630469995).

Almost surely, 2^1260939989 is an apocalyptic number.

It is an amenable number.

1260939989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260939989 is an equidigital number, since it uses as much as digits as its factorization.

1260939989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The square root of 1260939989 is about 35509.7168251170. The cubic root of 1260939989 is about 1080.3508202430.

The spelling of 1260939989 in words is "one billion, two hundred sixty million, nine hundred thirty-nine thousand, nine hundred eighty-nine".