1295797121 has 2 divisors, whose sum is σ = 1295797122. Its totient is φ = 1295797120.

The previous prime is 1295797109. The next prime is 1295797127. The reversal of 1295797121 is 1217975921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165266496 + 130530625 = 34136^2 + 11425^2 .

It is an emirp because it is prime and its reverse (1217975921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1295797121 - 2³⁰ = 222055297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1295797127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647898560 + 647898561.

It is an arithmetic number, because the mean of its divisors is an integer number (647898561).

Almost surely, 2^1295797121 is an apocalyptic number.

It is an amenable number.

1295797121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295797121 is an equidigital number, since it uses as much as digits as its factorization.

1295797121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 44.

The square root of 1295797121 is about 35997.1821258276. The cubic root of 1295797121 is about 1090.2154614327.

The spelling of 1295797121 in words is "one billion, two hundred ninety-five million, seven hundred ninety-seven thousand, one hundred twenty-one".