31533142 has 8 divisors (see below), whose sum is σ = 47538000. Its totient is φ = 15687144.

The previous prime is 31533133. The next prime is 31533143. The reversal of 31533142 is 24133513.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31533143) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 39217 + ... + 40012.

It is an arithmetic number, because the mean of its divisors is an integer number (5942250).

Almost surely, 2^31533142 is an apocalyptic number.

31533142 is a deficient number, since it is larger than the sum of its proper divisors (16004858).

31533142 is a wasteful number, since it uses less digits than its factorization.

31533142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79430.

The product of its digits is 1080, while the sum is 22.

The square root of 31533142 is about 5615.4378279881. The cubic root of 31533142 is about 315.9287012671.

Adding to 31533142 its reverse (24133513), we get a palindrome (55666655).

The spelling of 31533142 in words is "thirty-one million, five hundred thirty-three thousand, one hundred forty-two".