1347781381 has 4 divisors (see below), whose sum is σ = 1351077100. Its totient is φ = 1344485664.

The previous prime is 1347781367. The next prime is 1347781387. The reversal of 1347781381 is 1831877431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1831877431 = 223 ⋅8214697.

It can be written as a sum of positive squares in 2 ways, for example, as 1169024481 + 178756900 = 34191^2 + 13370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1347781381 - 2²⁷ = 1213563653 is a prime.

It is a super-2 number, since 2×1347781381² = 3633029301940534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1347781387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1647246 + ... + 1648063.

It is an arithmetic number, because the mean of its divisors is an integer number (337769275).

Almost surely, 2^1347781381 is an apocalyptic number.

It is an amenable number.

1347781381 is a deficient number, since it is larger than the sum of its proper divisors (3295719).

1347781381 is an equidigital number, since it uses as much as digits as its factorization.

1347781381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295718.

The product of its digits is 112896, while the sum is 43.

The square root of 1347781381 is about 36712.1421467067. The cubic root of 1347781381 is about 1104.6036759734.

The spelling of 1347781381 in words is "one billion, three hundred forty-seven million, seven hundred eighty-one thousand, three hundred eighty-one".