31512142 has 8 divisors (see below), whose sum is σ = 47710296. Its totient is φ = 15608712.

The previous prime is 31512121. The next prime is 31512161. The reversal of 31512142 is 24121513.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73413 + ... + 73840.

It is an arithmetic number, because the mean of its divisors is an integer number (5963787).

Almost surely, 2^31512142 is an apocalyptic number.

31512142 is a deficient number, since it is larger than the sum of its proper divisors (16198154).

31512142 is a wasteful number, since it uses less digits than its factorization.

31512142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147362.

The product of its digits is 240, while the sum is 19.

The square root of 31512142 is about 5613.5676712764. The cubic root of 31512142 is about 315.8585531031.

Adding to 31512142 its reverse (24121513), we get a palindrome (55633655).

The spelling of 31512142 in words is "thirty-one million, five hundred twelve thousand, one hundred forty-two".