361581 has 8 divisors (see below), whose sum is σ = 525984. Its totient is φ = 219120.

The previous prime is 361577. The next prime is 361637. The reversal of 361581 is 185163.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 361581 - 2² = 361577 is a prime.

It is a super-2 number, since 2×361581² = 261481639122, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 361581.

It is not an unprimeable number, because it can be changed into a prime (361511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5446 + ... + 5511.

It is an arithmetic number, because the mean of its divisors is an integer number (65748).

2³⁶¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

361581 is a deficient number, since it is larger than the sum of its proper divisors (164403).

361581 is a wasteful number, since it uses less digits than its factorization.

361581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10971.

The product of its digits is 720, while the sum is 24.

The square root of 361581 is about 601.3160566624. The cubic root of 361581 is about 71.2418519460.

The spelling of 361581 in words is "three hundred sixty-one thousand, five hundred eighty-one".