1312023289 has 2 divisors, whose sum is σ = 1312023290. Its totient is φ = 1312023288.

The previous prime is 1312023287. The next prime is 1312023301. The reversal of 1312023289 is 9823202131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 702674064 + 609349225 = 26508^2 + 24685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312023289 - 2¹ = 1312023287 is a prime.

It is a super-2 number, since 2×1312023289² = 3442810221756755042, which contains 22 as substring.

Together with 1312023287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1312023289.

It is not a weakly prime, because it can be changed into another prime (1312023287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656011644 + 656011645.

It is an arithmetic number, because the mean of its divisors is an integer number (656011645).

Almost surely, 2^1312023289 is an apocalyptic number.

It is an amenable number.

1312023289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312023289 is an equidigital number, since it uses as much as digits as its factorization.

1312023289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1312023289 is about 36221.8620310994. The cubic root of 1312023289 is about 1094.7472124155.

The spelling of 1312023289 in words is "one billion, three hundred twelve million, twenty-three thousand, two hundred eighty-nine".