1379189681 has 4 divisors (see below), whose sum is σ = 1379693412. Its totient is φ = 1378685952.

The previous prime is 1379189629. The next prime is 1379189683. The reversal of 1379189681 is 1869819731.

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 830880625 + 548309056 = 28825^2 + 23416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379189681 - 2²⁶ = 1312080817 is a prime.

It is a super-2 number, since 2×1379189681² = 3804328352353763522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379189683) 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, 247736 + ... + 253241.

It is an arithmetic number, because the mean of its divisors is an integer number (344923353).

Almost surely, 2^1379189681 is an apocalyptic number.

It is an amenable number.

1379189681 is a deficient number, since it is larger than the sum of its proper divisors (503731).

1379189681 is an equidigital number, since it uses as much as digits as its factorization.

1379189681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503730.

The product of its digits is 653184, while the sum is 53.

The square root of 1379189681 is about 37137.4431133863. The cubic root of 1379189681 is about 1113.1183264054.

The spelling of 1379189681 in words is "one billion, three hundred seventy-nine million, one hundred eighty-nine thousand, six hundred eighty-one".