311642 has 4 divisors (see below), whose sum is σ = 467466. Its totient is φ = 155820.

The previous prime is 311609. The next prime is 311653. The reversal of 311642 is 246113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246113 = 7 ⋅35159.

It can be written as a sum of positive squares in only one way, i.e., 203401 + 108241 = 451^2 + 329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 311642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77909 + ... + 77912.

2³¹¹⁶⁴² is an apocalyptic number.

311642 is a deficient number, since it is larger than the sum of its proper divisors (155824).

311642 is a wasteful number, since it uses less digits than its factorization.

311642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155823.

The product of its digits is 144, while the sum is 17.

The square root of 311642 is about 558.2490483646. The cubic root of 311642 is about 67.7982776137.

Adding to 311642 its reverse (246113), we get a palindrome (557755).

The spelling of 311642 in words is "three hundred eleven thousand, six hundred forty-two".