361861 has 4 divisors (see below), whose sum is σ = 366892. Its totient is φ = 356832.

The previous prime is 361843. The next prime is 361871. The reversal of 361861 is 168163.

361861 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168163 = 337 ⋅499.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 101761 = 510^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 361861 - 2⁹ = 361349 is a prime.

It is a Duffinian number.

361861 is an undulating number in base 16.

361861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361871) 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, 2406 + ... + 2551.

It is an arithmetic number, because the mean of its divisors is an integer number (91723).

2³⁶¹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

361861 is a deficient number, since it is larger than the sum of its proper divisors (5031).

361861 is an equidigital number, since it uses as much as digits as its factorization.

361861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030.

The product of its digits is 864, while the sum is 25.

The square root of 361861 is about 601.5488342604. The cubic root of 361861 is about 71.2602365512.

The spelling of 361861 in words is "three hundred sixty-one thousand, eight hundred sixty-one".