1391706913 has 4 divisors (see below), whose sum is σ = 1417965588. Its totient is φ = 1365448240.

The previous prime is 1391706871. The next prime is 1391706917. The reversal of 1391706913 is 3196071931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3196071931 = 13 ⋅245851687.

It can be written as a sum of positive squares in 2 ways, for example, as 1235381904 + 156325009 = 35148^2 + 12503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391706913 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391706917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13129258 + ... + 13129363.

It is an arithmetic number, because the mean of its divisors is an integer number (354491397).

Almost surely, 2^1391706913 is an apocalyptic number.

It is an amenable number.

1391706913 is a deficient number, since it is larger than the sum of its proper divisors (26258675).

1391706913 is an equidigital number, since it uses as much as digits as its factorization.

1391706913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26258674.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1391706913 is about 37305.5882275029. The cubic root of 1391706913 is about 1116.4756649729.

The spelling of 1391706913 in words is "one billion, three hundred ninety-one million, seven hundred six thousand, nine hundred thirteen".