1289309397631 has 8 divisors (see below), whose sum is σ = 1357200161280. Its totient is φ = 1221421871448.

The previous prime is 1289309397619. The next prime is 1289309397643. The reversal of 1289309397631 is 1367939039821.

It is an interprime number because it is at equal distance from previous prime (1289309397619) and next prime (1289309397643).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289309397631 is a prime.

It is a super-2 number, since 2×1289309397631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1289309397631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289309397731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30450 + ... + 1606096.

It is an arithmetic number, because the mean of its divisors is an integer number (169650020160).

Almost surely, 2^{1289309397631} is an apocalyptic number.

1289309397631 is a deficient number, since it is larger than the sum of its proper divisors (67890763649).

1289309397631 is a wasteful number, since it uses less digits than its factorization.

1289309397631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618733.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The spelling of 1289309397631 in words is "one trillion, two hundred eighty-nine billion, three hundred nine million, three hundred ninety-seven thousand, six hundred thirty-one".