311856889 has 4 divisors (see below), whose sum is σ = 312158080. Its totient is φ = 311555700.

The previous prime is 311856887. The next prime is 311856901. The reversal of 311856889 is 988658113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311856889 - 2¹ = 311856887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311856887) 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, 149037 + ... + 151114.

It is an arithmetic number, because the mean of its divisors is an integer number (78039520).

Almost surely, 2^311856889 is an apocalyptic number.

It is an amenable number.

311856889 is a deficient number, since it is larger than the sum of its proper divisors (301191).

311856889 is a wasteful number, since it uses less digits than its factorization.

311856889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301190.

The product of its digits is 414720, while the sum is 49.

The square root of 311856889 is about 17659.4702355422. The cubic root of 311856889 is about 678.1385719611.

The spelling of 311856889 in words is "three hundred eleven million, eight hundred fifty-six thousand, eight hundred eighty-nine".