311143643 has 2 divisors, whose sum is σ = 311143644. Its totient is φ = 311143642.

The previous prime is 311143631. The next prime is 311143663. The reversal of 311143643 is 346341113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311143643 - 2⁴ = 311143627 is a prime.

It is a super-2 number, since 2×311143643² = 193620733158622898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311143603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155571821 + 155571822.

It is an arithmetic number, because the mean of its divisors is an integer number (155571822).

Almost surely, 2^311143643 is an apocalyptic number.

311143643 is a deficient number, since it is larger than the sum of its proper divisors (1).

311143643 is an equidigital number, since it uses as much as digits as its factorization.

311143643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 311143643 is about 17639.2642420255. The cubic root of 311143643 is about 677.6211884534.

Adding to 311143643 its reverse (346341113), we get a palindrome (657484756).

The spelling of 311143643 in words is "three hundred eleven million, one hundred forty-three thousand, six hundred forty-three".