311040143 has 24 divisors (see below), whose sum is σ = 346040640. Its totient is φ = 278553600.

The previous prime is 311040091. The next prime is 311040157. The reversal of 311040143 is 341040113.

It is not a de Polignac number, because 311040143 - 2¹⁰ = 311039119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311040343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1290503 + ... + 1290743.

It is an arithmetic number, because the mean of its divisors is an integer number (14418360).

Almost surely, 2^311040143 is an apocalyptic number.

311040143 is a deficient number, since it is larger than the sum of its proper divisors (35000497).

311040143 is a wasteful number, since it uses less digits than its factorization.

311040143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 311040143 is about 17636.3302021707. The cubic root of 311040143 is about 677.5460446278.

Adding to 311040143 its reverse (341040113), we get a palindrome (652080256).

The spelling of 311040143 in words is "three hundred eleven million, forty thousand, one hundred forty-three".