1321123259 has 2 divisors, whose sum is σ = 1321123260. Its totient is φ = 1321123258.

The previous prime is 1321123253. The next prime is 1321123301. The reversal of 1321123259 is 9523211231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321123259 - 2⁸ = 1321123003 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321123253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660561629 + 660561630.

It is an arithmetic number, because the mean of its divisors is an integer number (660561630).

Almost surely, 2^1321123259 is an apocalyptic number.

1321123259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321123259 is an equidigital number, since it uses as much as digits as its factorization.

1321123259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1321123259 is about 36347.2593052076. The cubic root of 1321123259 is about 1097.2723767296.

The spelling of 1321123259 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred fifty-nine".