361891 has 4 divisors (see below), whose sum is σ = 374400. Its totient is φ = 349384.

The previous prime is 361877. The next prime is 361901. The reversal of 361891 is 198163.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198163 = 7 ⋅28309.

It is a cyclic number.

It is not a de Polignac number, because 361891 - 2⁷ = 361763 is a prime.

It is a Duffinian 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, 6211 + ... + 6268.

It is an arithmetic number, because the mean of its divisors is an integer number (93600).

2³⁶¹⁸⁹¹ is an apocalyptic number.

361891 is a deficient number, since it is larger than the sum of its proper divisors (12509).

361891 is a wasteful number, since it uses less digits than its factorization.

361891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12508.

The product of its digits is 1296, while the sum is 28.

The square root of 361891 is about 601.5737693750. The cubic root of 361891 is about 71.2622057678.

The spelling of 361891 in words is "three hundred sixty-one thousand, eight hundred ninety-one".