1309856997 has 8 divisors (see below), whose sum is σ = 1751986656. Its totient is φ = 870482672.

The previous prime is 1309856993. The next prime is 1309857001. The reversal of 1309856997 is 7996589031.

It is an interprime number because it is at equal distance from previous prime (1309856993) and next prime (1309857001).

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

It is a cyclic number.

It is not a de Polignac number, because 1309856997 - 2² = 1309856993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309856993) 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, 687723 + ... + 689624.

It is an arithmetic number, because the mean of its divisors is an integer number (218998332).

Almost surely, 2^1309856997 is an apocalyptic number.

It is an amenable number.

1309856997 is a deficient number, since it is larger than the sum of its proper divisors (442129659).

1309856997 is a wasteful number, since it uses less digits than its factorization.

1309856997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377667.

The product of its (nonzero) digits is 3674160, while the sum is 57.

The square root of 1309856997 is about 36191.9465765521. The cubic root of 1309856997 is about 1094.1443652530.

The spelling of 1309856997 in words is "one billion, three hundred nine million, eight hundred fifty-six thousand, nine hundred ninety-seven".