311908123 has 4 divisors (see below), whose sum is σ = 328324360. Its totient is φ = 295491888.

The previous prime is 311908109. The next prime is 311908139. The reversal of 311908123 is 321809113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321809113 = 487 ⋅660799.

It is a cyclic number.

It is not a de Polignac number, because 311908123 - 2¹⁷ = 311777051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311908091 and 311908100.

It is not an unprimeable number, because it can be changed into a prime (311908153) 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, 8208090 + ... + 8208127.

It is an arithmetic number, because the mean of its divisors is an integer number (82081090).

Almost surely, 2^311908123 is an apocalyptic number.

311908123 is a deficient number, since it is larger than the sum of its proper divisors (16416237).

311908123 is a wasteful number, since it uses less digits than its factorization.

311908123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16416236.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 311908123 is about 17660.9207857348. The cubic root of 311908123 is about 678.1757063544.

The spelling of 311908123 in words is "three hundred eleven million, nine hundred eight thousand, one hundred twenty-three".