311999998 has 4 divisors (see below), whose sum is σ = 468000000. Its totient is φ = 155999998.

The previous prime is 311999981. The next prime is 311999999. The reversal of 311999998 is 899999113.

311999998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311999999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77999998 + ... + 78000001.

It is an arithmetic number, because the mean of its divisors is an integer number (117000000).

Almost surely, 2^311999998 is an apocalyptic number.

311999998 is a deficient number, since it is larger than the sum of its proper divisors (156000002).

311999998 is a wasteful number, since it uses less digits than its factorization.

311999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156000001.

The product of its digits is 1417176, while the sum is 58.

The square root of 311999998 is about 17663.5216760418. The cubic root of 311999998 is about 678.2422871536.

The spelling of 311999998 in words is "three hundred eleven million, nine hundred ninety-nine thousand, nine hundred ninety-eight".