1297959823 has 2 divisors, whose sum is σ = 1297959824. Its totient is φ = 1297959822.

The previous prime is 1297959799. The next prime is 1297959827. The reversal of 1297959823 is 3289597921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1297959823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297959827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648979911 + 648979912.

It is an arithmetic number, because the mean of its divisors is an integer number (648979912).

Almost surely, 2^1297959823 is an apocalyptic number.

1297959823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297959823 is an equidigital number, since it uses as much as digits as its factorization.

1297959823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 1297959823 is about 36027.2094811685. The cubic root of 1297959823 is about 1090.8216521696.

The spelling of 1297959823 in words is "one billion, two hundred ninety-seven million, nine hundred fifty-nine thousand, eight hundred twenty-three".