361813 has 4 divisors (see below), whose sum is σ = 377568. Its totient is φ = 346060.

The previous prime is 361807. The next prime is 361843. The reversal of 361813 is 318163.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318163 = 37 ⋅8599.

It is a cyclic number.

It is not a de Polignac number, because 361813 - 2¹³ = 353621 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361843) 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, 7843 + ... + 7888.

It is an arithmetic number, because the mean of its divisors is an integer number (94392).

2³⁶¹⁸¹³ is an apocalyptic number.

It is an amenable number.

361813 is a deficient number, since it is larger than the sum of its proper divisors (15755).

361813 is a wasteful number, since it uses less digits than its factorization.

361813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15754.

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

The square root of 361813 is about 601.5089359270. The cubic root of 361813 is about 71.2570855783.

Adding to 361813 its reverse (318163), we get a palindrome (679976).

It can be divided in two parts, 36 and 1813, that added together give a square (1849 = 43²).

The spelling of 361813 in words is "three hundred sixty-one thousand, eight hundred thirteen".