31343120 has 20 divisors (see below), whose sum is σ = 72872940. Its totient is φ = 12537216.

The previous prime is 31343119. The next prime is 31343129. The reversal of 31343120 is 2134313.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 22886656 = 2908^2 + 4784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (31343129) 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, 195815 + ... + 195974.

It is an arithmetic number, because the mean of its divisors is an integer number (3643647).

Almost surely, 2^31343120 is an apocalyptic number.

It is an amenable number.

31343120 is an abundant number, since it is smaller than the sum of its proper divisors (41529820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31343120 is a wasteful number, since it uses less digits than its factorization.

31343120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391802 (or 391796 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31343120 is about 5598.4926542776. The cubic root of 31343120 is about 315.2928158211.

Adding to 31343120 its reverse (2134313), we get a palindrome (33477433).

The spelling of 31343120 in words is "thirty-one million, three hundred forty-three thousand, one hundred twenty".