311145442 has 4 divisors (see below), whose sum is σ = 466718166. Its totient is φ = 155572720.

The previous prime is 311145391. The next prime is 311145479. The reversal of 311145442 is 244541113.

311145442 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, and also an emirpimes, since its reverse is a distinct semiprime: 244541113 = 31 ⋅7888423.

It can be written as a sum of positive squares in only one way, i.e., 253096281 + 58049161 = 15909^2 + 7619^2 .

It is a super-2 number, since 2×311145442² = 193622972154750728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77786359 + ... + 77786362.

Almost surely, 2^311145442 is an apocalyptic number.

311145442 is a deficient number, since it is larger than the sum of its proper divisors (155572724).

311145442 is a wasteful number, since it uses less digits than its factorization.

311145442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155572723.

The product of its digits is 1920, while the sum is 25.

The square root of 311145442 is about 17639.3152361422. The cubic root of 311145442 is about 677.6224944292.

Adding to 311145442 its reverse (244541113), we get a palindrome (555686555).

The spelling of 311145442 in words is "three hundred eleven million, one hundred forty-five thousand, four hundred forty-two".