1391449313 has 4 divisors (see below), whose sum is σ = 1393719828. Its totient is φ = 1389178800.

The previous prime is 1391449307. The next prime is 1391449321. The reversal of 1391449313 is 3139441931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615436864 + 776012449 = 24808^2 + 27857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391449313 - 2⁸ = 1391449057 is a prime.

It is a super-2 number, since 2×1391449313² = 3872262381296343938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391449393) 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, 1134338 + ... + 1135563.

It is an arithmetic number, because the mean of its divisors is an integer number (348429957).

Almost surely, 2^1391449313 is an apocalyptic number.

It is an amenable number.

1391449313 is a deficient number, since it is larger than the sum of its proper divisors (2270515).

1391449313 is an equidigital number, since it uses as much as digits as its factorization.

1391449313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270514.

The product of its digits is 34992, while the sum is 38.

The square root of 1391449313 is about 37302.1355018717. The cubic root of 1391449313 is about 1116.4067754974.

The spelling of 1391449313 in words is "one billion, three hundred ninety-one million, four hundred forty-nine thousand, three hundred thirteen".