311669 has 4 divisors (see below), whose sum is σ = 313260. Its totient is φ = 310080.

The previous prime is 311659. The next prime is 311677. The reversal of 311669 is 966113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 180625 + 131044 = 425^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 311669 - 2⁴ = 311653 is a prime.

It is a super-2 number, since 2×311669² = 194275131122, 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 (311609) 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, 452 + ... + 909.

It is an arithmetic number, because the mean of its divisors is an integer number (78315).

2³¹¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

311669 is a deficient number, since it is larger than the sum of its proper divisors (1591).

311669 is a wasteful number, since it uses less digits than its factorization.

311669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590.

The product of its digits is 972, while the sum is 26.

The square root of 311669 is about 558.2732305959. The cubic root of 311669 is about 67.8002355233.

The spelling of 311669 in words is "three hundred eleven thousand, six hundred sixty-nine".