1297809395895 has 16 divisors (see below), whose sum is σ = 2087254079712. Its totient is φ = 688578662400.

The previous prime is 1297809395891. The next prime is 1297809395899. The reversal of 1297809395895 is 5985939087921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1297809395891) and next prime (1297809395899).

It is not a de Polignac number, because 1297809395895 - 2² = 1297809395891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297809395891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224143806 + ... + 224149595.

It is an arithmetic number, because the mean of its divisors is an integer number (130453379982).

Almost surely, 2^{1297809395895} is an apocalyptic number.

1297809395895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1297809395895 is a deficient number, since it is larger than the sum of its proper divisors (789444683817).

1297809395895 is a wasteful number, since it uses less digits than its factorization.

1297809395895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448293602.

The product of its (nonzero) digits is 440899200, while the sum is 75.

The spelling of 1297809395895 in words is "one trillion, two hundred ninety-seven billion, eight hundred nine million, three hundred ninety-five thousand, eight hundred ninety-five".