361381 has 4 divisors (see below), whose sum is σ = 362700. Its totient is φ = 360064.

The previous prime is 361373. The next prime is 361409. The reversal of 361381 is 183163.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183163 = 151 ⋅1213.

It can be written as a sum of positive squares in 2 ways, for example, as 36481 + 324900 = 191^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 361381 - 2³ = 361373 is a prime.

It is a super-2 number, since 2×361381² = 261192454322, which contains 22 as substring.

It is a Duffinian number.

361381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361321) 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, 76 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (90675).

2³⁶¹³⁸¹ is an apocalyptic number.

It is an amenable number.

361381 is a deficient number, since it is larger than the sum of its proper divisors (1319).

361381 is an equidigital number, since it uses as much as digits as its factorization.

361381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its digits is 432, while the sum is 22.

The square root of 361381 is about 601.1497317641. The cubic root of 361381 is about 71.2287142736.

The spelling of 361381 in words is "three hundred sixty-one thousand, three hundred eighty-one".