381081361 has 4 divisors (see below), whose sum is σ = 381362724. Its totient is φ = 380800000.

The previous prime is 381081343. The next prime is 381081391. The reversal of 381081361 is 163180183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163180183 = 463 ⋅352441.

It can be written as a sum of positive squares in 2 ways, for example, as 69205761 + 311875600 = 8319^2 + 17660^2 .

It is a cyclic number.

It is not a de Polignac number, because 381081361 - 2⁵ = 381081329 is a prime.

It is a super-2 number, since 2×381081361² = 290446007403224642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381081301) 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, 138640 + ... + 141361.

It is an arithmetic number, because the mean of its divisors is an integer number (95340681).

Almost surely, 2^381081361 is an apocalyptic number.

It is an amenable number.

381081361 is a deficient number, since it is larger than the sum of its proper divisors (281363).

381081361 is a wasteful number, since it uses less digits than its factorization.

381081361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281362.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 381081361 is about 19521.3053098403. The cubic root of 381081361 is about 725.0020521543.

The spelling of 381081361 in words is "three hundred eighty-one million, eighty-one thousand, three hundred sixty-one".