311661343 has 4 divisors (see below), whose sum is σ = 356184400. Its totient is φ = 267138288.

The previous prime is 311661331. The next prime is 311661373. The reversal of 311661343 is 343166113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 343166113 = 3433 ⋅99961.

It is a cyclic number.

It is not a de Polignac number, because 311661343 - 2⁹ = 311660831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311661373) 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, 22261518 + ... + 22261531.

It is an arithmetic number, because the mean of its divisors is an integer number (89046100).

Almost surely, 2^311661343 is an apocalyptic number.

311661343 is a deficient number, since it is larger than the sum of its proper divisors (44523057).

311661343 is an equidigital number, since it uses as much as digits as its factorization.

311661343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44523056.

The product of its digits is 3888, while the sum is 28.

The square root of 311661343 is about 17653.9327913074. The cubic root of 311661343 is about 677.9968028611.

The spelling of 311661343 in words is "three hundred eleven million, six hundred sixty-one thousand, three hundred forty-three".