1289971 has 2 divisors, whose sum is σ = 1289972. Its totient is φ = 1289970.

The previous prime is 1289969. The next prime is 1290013. The reversal of 1289971 is 1799821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1289971 - 2¹ = 1289969 is a prime.

Together with 1289969, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1289971.

It is not a weakly prime, because it can be changed into another prime (1289921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644985 + 644986.

It is an arithmetic number, because the mean of its divisors is an integer number (644986).

2^1289971 is an apocalyptic number.

1289971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289971 is an equidigital number, since it uses as much as digits as its factorization.

1289971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 1289971 is about 1135.7689025502. The cubic root of 1289971 is about 108.8579076020.

The spelling of 1289971 in words is "one million, two hundred eighty-nine thousand, nine hundred seventy-one".