1289613971 has 2 divisors, whose sum is σ = 1289613972. Its totient is φ = 1289613970.

The previous prime is 1289613943. The next prime is 1289613977. The reversal of 1289613971 is 1793169821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1289613971 - 2¹⁸ = 1289351827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1289613977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644806985 + 644806986.

It is an arithmetic number, because the mean of its divisors is an integer number (644806986).

Almost surely, 2^1289613971 is an apocalyptic number.

1289613971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289613971 is an equidigital number, since it uses as much as digits as its factorization.

1289613971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 1289613971 is about 35911.1956219784. The cubic root of 1289613971 is about 1088.4786370278.

The spelling of 1289613971 in words is "one billion, two hundred eighty-nine million, six hundred thirteen thousand, nine hundred seventy-one".