312861 has 4 divisors (see below), whose sum is σ = 417152. Its totient is φ = 208572.

The previous prime is 312857. The next prime is 312863. The reversal of 312861 is 168213.

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.

It is not a de Polignac number, because 312861 - 2² = 312857 is a prime.

It is a d-powerful number, because it can be written as 3³ + 1 + 8⁵ + 2⁷ + 6⁷ + 1 .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312863) 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, 52141 + ... + 52146.

It is an arithmetic number, because the mean of its divisors is an integer number (104288).

2³¹²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

312861 is a deficient number, since it is larger than the sum of its proper divisors (104291).

312861 is a wasteful number, since it uses less digits than its factorization.

312861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104290.

The product of its digits is 288, while the sum is 21.

The square root of 312861 is about 559.3397893946. The cubic root of 312861 is about 67.8865611528.

It can be divided in two parts, 3 and 12861, that multiplied together give a palindrome (38583).

The spelling of 312861 in words is "three hundred twelve thousand, eight hundred sixty-one".