311972042 has 4 divisors (see below), whose sum is σ = 467958066. Its totient is φ = 155986020.

The previous prime is 311972029. The next prime is 311972047. The reversal of 311972042 is 240279113.

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

It can be written as a sum of positive squares in only one way, i.e., 231313681 + 80658361 = 15209^2 + 8981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 311971996 and 311972014.

It is not an unprimeable number, because it can be changed into a prime (311972047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77993009 + ... + 77993012.

Almost surely, 2^311972042 is an apocalyptic number.

311972042 is a deficient number, since it is larger than the sum of its proper divisors (155986024).

311972042 is a wasteful number, since it uses less digits than its factorization.

311972042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155986023.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 311972042 is about 17662.7303098926. The cubic root of 311972042 is about 678.2220291324. Note that the first 3 decimals are identical.

The spelling of 311972042 in words is "three hundred eleven million, nine hundred seventy-two thousand, forty-two".