381318689 has 4 divisors (see below), whose sum is σ = 381371460. Its totient is φ = 381265920.

The previous prime is 381318677. The next prime is 381318739. The reversal of 381318689 is 986813183.

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: 986813183 = 23 ⋅42904921.

It can be written as a sum of positive squares in 2 ways, for example, as 4376464 + 376942225 = 2092^2 + 19415^2 .

It is a cyclic number.

It is not a de Polignac number, because 381318689 - 2⁸ = 381318433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381318629) 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, 13424 + ... + 30705.

It is an arithmetic number, because the mean of its divisors is an integer number (95342865).

Almost surely, 2^381318689 is an apocalyptic number.

It is an amenable number.

381318689 is a deficient number, since it is larger than the sum of its proper divisors (52771).

381318689 is an equidigital number, since it uses as much as digits as its factorization.

381318689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52770.

The product of its digits is 248832, while the sum is 47.

The square root of 381318689 is about 19527.3830555966. The cubic root of 381318689 is about 725.1525253411.

The spelling of 381318689 in words is "three hundred eighty-one million, three hundred eighteen thousand, six hundred eighty-nine".