1391275379 has 4 divisors (see below), whose sum is σ = 1498296576. Its totient is φ = 1284254184.

The previous prime is 1391275367. The next prime is 1391275397. The reversal of 1391275379 is 9735721931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391275379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391271379) 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, 53510579 + ... + 53510604.

It is an arithmetic number, because the mean of its divisors is an integer number (374574144).

Almost surely, 2^1391275379 is an apocalyptic number.

1391275379 is a deficient number, since it is larger than the sum of its proper divisors (107021197).

1391275379 is a wasteful number, since it uses less digits than its factorization.

1391275379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107021196.

The product of its digits is 357210, while the sum is 47.

The square root of 1391275379 is about 37299.8040075280. The cubic root of 1391275379 is about 1116.3602558515.

The spelling of 1391275379 in words is "one billion, three hundred ninety-one million, two hundred seventy-five thousand, three hundred seventy-nine".