311642644 has 6 divisors (see below), whose sum is σ = 545374634. Its totient is φ = 155821320.

The previous prime is 311642627. The next prime is 311642677. The reversal of 311642644 is 446246113.

It can be written as a sum of positive squares in only one way, i.e., 186650244 + 124992400 = 13662^2 + 11180^2 .

It is a super-2 number, since 2×311642644² = 194242275118621472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 38955327 + ... + 38955334.

Almost surely, 2^311642644 is an apocalyptic number.

It is an amenable number.

311642644 is a deficient number, since it is larger than the sum of its proper divisors (233731990).

311642644 is a wasteful number, since it uses less digits than its factorization.

311642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77910665 (or 77910663 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 311642644 is about 17653.4031846554. The cubic root of 311642644 is about 677.9832431474.

Adding to 311642644 its reverse (446246113), we get a palindrome (757888757).

The spelling of 311642644 in words is "three hundred eleven million, six hundred forty-two thousand, six hundred forty-four".