311431 has 4 divisors (see below), whose sum is σ = 322200. Its totient is φ = 300664.

The previous prime is 311419. The next prime is 311447. The reversal of 311431 is 134113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311431 - 2⁷ = 311303 is a prime.

It is a super-2 number, since 2×311431² = 193978535522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5341 + ... + 5398.

It is an arithmetic number, because the mean of its divisors is an integer number (80550).

2³¹¹⁴³¹ is an apocalyptic number.

311431 is a deficient number, since it is larger than the sum of its proper divisors (10769).

311431 is a wasteful number, since it uses less digits than its factorization.

311431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10768.

The product of its digits is 36, while the sum is 13.

The square root of 311431 is about 558.0600326130. The cubic root of 311431 is about 67.7829730159.

Adding to 311431 its reverse (134113), we get a palindrome (445544).

The spelling of 311431 in words is "three hundred eleven thousand, four hundred thirty-one".