1391312649 has 8 divisors (see below), whose sum is σ = 1877434272. Its totient is φ = 916366400.

The previous prime is 1391312647. The next prime is 1391312653. The reversal of 1391312649 is 9462131931.

It is a happy number.

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 1391312649 - 2¹ = 1391312647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1391312647) 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, 2793552 + ... + 2794049.

It is an arithmetic number, because the mean of its divisors is an integer number (234679284).

Almost surely, 2^1391312649 is an apocalyptic number.

It is an amenable number.

1391312649 is a deficient number, since it is larger than the sum of its proper divisors (486121623).

1391312649 is an equidigital number, since it uses as much as digits as its factorization.

1391312649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587687.

The product of its digits is 34992, while the sum is 39.

The square root of 1391312649 is about 37300.3036046625. The cubic root of 1391312649 is about 1116.3702242532.

It can be divided in two parts, 13913 and 12649, that added together give a palindrome (26562).

The spelling of 1391312649 in words is "one billion, three hundred ninety-one million, three hundred twelve thousand, six hundred forty-nine".