361591 has 4 divisors (see below), whose sum is σ = 363400. Its totient is φ = 359784.

The previous prime is 361577. The next prime is 361637. The reversal of 361591 is 195163.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 361591 - 2⁷ = 361463 is a prime.

It is a Duffinian number.

361591 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 561 + ... + 1018.

It is an arithmetic number, because the mean of its divisors is an integer number (90850).

2³⁶¹⁵⁹¹ is an apocalyptic number.

361591 is a deficient number, since it is larger than the sum of its proper divisors (1809).

361591 is a wasteful number, since it uses less digits than its factorization.

361591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its digits is 810, while the sum is 25.

The square root of 361591 is about 601.3243716997. The cubic root of 361591 is about 71.2425087025.

The spelling of 361591 in words is "three hundred sixty-one thousand, five hundred ninety-one".