1391299671 has 4 divisors (see below), whose sum is σ = 1855066232. Its totient is φ = 927533112.

The previous prime is 1391299667. The next prime is 1391299673. The reversal of 1391299671 is 1769921931.

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

It is not a de Polignac number, because 1391299671 - 2² = 1391299667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391299671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391299673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231883276 + ... + 231883281.

It is an arithmetic number, because the mean of its divisors is an integer number (463766558).

Almost surely, 2^1391299671 is an apocalyptic number.

1391299671 is a deficient number, since it is larger than the sum of its proper divisors (463766561).

1391299671 is an equidigital number, since it uses as much as digits as its factorization.

1391299671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463766560.

The product of its digits is 183708, while the sum is 48.

The square root of 1391299671 is about 37300.1296378444. The cubic root of 1391299671 is about 1116.3667531192.

The spelling of 1391299671 in words is "one billion, three hundred ninety-one million, two hundred ninety-nine thousand, six hundred seventy-one".