1312081797 has 8 divisors (see below), whose sum is σ = 1884014944. Its totient is φ = 807434928.

The previous prime is 1312081787. The next prime is 1312081801. The reversal of 1312081797 is 7971802131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1312081797 - 2¹⁴ = 1312065413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 33643123 = 1312081797 / (1 + 3 + 1 + 2 + 0 + 8 + 1 + 7 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312081787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16821523 + ... + 16821600.

It is an arithmetic number, because the mean of its divisors is an integer number (235501868).

Almost surely, 2^1312081797 is an apocalyptic number.

It is an amenable number.

1312081797 is a deficient number, since it is larger than the sum of its proper divisors (571933147).

1312081797 is a wasteful number, since it uses less digits than its factorization.

1312081797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33643139.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 1312081797 is about 36222.6696558937. The cubic root of 1312081797 is about 1094.7634851241.

The spelling of 1312081797 in words is "one billion, three hundred twelve million, eighty-one thousand, seven hundred ninety-seven".