31143316 has 12 divisors (see below), whose sum is σ = 54622260. Its totient is φ = 15536960.

The previous prime is 31143271. The next prime is 31143317. The reversal of 31143316 is 61334113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4579600 + 26563716 = 2140^2 + 5154^2 .

It is a super-2 number, since 2×31143316² = 1939812262951712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6601 + ... + 10288.

It is an arithmetic number, because the mean of its divisors is an integer number (4551855).

It is a self-describing number.

Almost surely, 2^31143316 is an apocalyptic number.

It is an amenable number.

31143316 is a deficient number, since it is larger than the sum of its proper divisors (23478944).

31143316 is a wasteful number, since it uses less digits than its factorization.

31143316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17354 (or 17352 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 31143316 is about 5580.6196788529. The cubic root of 31143316 is about 314.6214180324.

Adding to 31143316 its reverse (61334113), we get a palindrome (92477429).

The spelling of 31143316 in words is "thirty-one million, one hundred forty-three thousand, three hundred sixteen".