1391165379 has 6 divisors (see below), whose sum is σ = 2009461116. Its totient is φ = 927443580.

The previous prime is 1391165371. The next prime is 1391165381. The reversal of 1391165379 is 9735611931.

It is a happy number.

1391165379 is a `hidden beast` number, since 13 + 91 + 16 + 537 + 9 = 666.

It is not a de Polignac number, because 1391165379 - 2³ = 1391165371 is a prime.

It is a super-2 number, since 2×1391165379² = 3870682223456427282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1391165371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77286957 + ... + 77286974.

It is an arithmetic number, because the mean of its divisors is an integer number (334910186).

Almost surely, 2^1391165379 is an apocalyptic number.

1391165379 is a deficient number, since it is larger than the sum of its proper divisors (618295737).

1391165379 is a wasteful number, since it uses less digits than its factorization.

1391165379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154573937 (or 154573934 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 1391165379 is about 37298.3294398020. The cubic root of 1391165379 is about 1116.3308337193.

The spelling of 1391165379 in words is "one billion, three hundred ninety-one million, one hundred sixty-five thousand, three hundred seventy-nine".