311491 has 8 divisors (see below), whose sum is σ = 335664. Its totient is φ = 288000.

The previous prime is 311473. The next prime is 311533. The reversal of 311491 is 194113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 8-Lehmer number, since φ(311491) divides (311491-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 311491 - 2¹³ = 303299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311291) 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 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (41958).

2³¹¹⁴⁹¹ is an apocalyptic number.

311491 is a deficient number, since it is larger than the sum of its proper divisors (24173).

311491 is a wasteful number, since it uses less digits than its factorization.

311491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its digits is 108, while the sum is 19.

The square root of 311491 is about 558.1137876813. The cubic root of 311491 is about 67.7873257374.

The spelling of 311491 in words is "three hundred eleven thousand, four hundred ninety-one".