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31142 = 223677

31142 has 8 divisors (see below), whose sum is σ = 48816. Its totient is φ = 14872.

The previous prime is 31139. The next prime is 31147. The reversal of 31142 is 24113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31147) 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, 293 + ... + 384.

It is an arithmetic number, because the mean of its divisors is an integer number (6102).

231142 is an apocalyptic number.

31142 is a deficient number, since it is larger than the sum of its proper divisors (17674).

31142 is a wasteful number, since it uses less digits than its factorization.

31142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its digits is 24, while the sum is 11.

The square root of 31142 is about 176.4709607839. The cubic root of 31142 is about 31.4616986395.

Adding to 31142 its reverse (24113), we get a palindrome (55255).

It can be divided in two parts, 311 and 42, that added together give a palindrome (353).

The spelling of 31142 in words is "thirty-one thousand, one hundred forty-two".

Divisors: 1 2 23 46 677 1354 15571 31142