31143142 has 4 divisors (see below), whose sum is σ = 46714716. Its totient is φ = 15571570.

The previous prime is 31143113. The next prime is 31143157. The reversal of 31143142 is 24134113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24134113 = 1051 ⋅22963.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7785784 + ... + 7785787.

It is an arithmetic number, because the mean of its divisors is an integer number (11678679).

Almost surely, 2^31143142 is an apocalyptic number.

31143142 is a deficient number, since it is larger than the sum of its proper divisors (15571574).

31143142 is a wasteful number, since it uses less digits than its factorization.

31143142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15571573.

The product of its digits is 288, while the sum is 19.

The square root of 31143142 is about 5580.6040891645. The cubic root of 31143142 is about 314.6208320936.

Adding to 31143142 its reverse (24134113), we get a palindrome (55277255).

The spelling of 31143142 in words is "thirty-one million, one hundred forty-three thousand, one hundred forty-two".