31643142 has 8 divisors (see below), whose sum is σ = 63286296. Its totient is φ = 10547712.

The previous prime is 31643123. The next prime is 31643153. The reversal of 31643142 is 24134613.

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

31643142 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2636923 + ... + 2636934.

It is an arithmetic number, because the mean of its divisors is an integer number (7910787).

Almost surely, 2^31643142 is an apocalyptic number.

31643142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31643142 is a wasteful number, since it uses less digits than its factorization.

31643142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5273862.

The product of its digits is 1728, while the sum is 24.

The square root of 31643142 is about 5625.2237288840. The cubic root of 31643142 is about 316.2956361103.

Adding to 31643142 its reverse (24134613), we get a palindrome (55777755).

The spelling of 31643142 in words is "thirty-one million, six hundred forty-three thousand, one hundred forty-two".