31271642 has 4 divisors (see below), whose sum is σ = 46907466. Its totient is φ = 15635820.

The previous prime is 31271641. The next prime is 31271659. The reversal of 31271642 is 24617213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 346921 = 5561^2 + 589^2 .

It is not an unprimeable number, because it can be changed into a prime (31271641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7817909 + ... + 7817912.

Almost surely, 2^31271642 is an apocalyptic number.

31271642 is a deficient number, since it is larger than the sum of its proper divisors (15635824).

31271642 is a wasteful number, since it uses less digits than its factorization.

31271642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15635823.

The product of its digits is 2016, while the sum is 26.

The square root of 31271642 is about 5592.1053280495. The cubic root of 31271642 is about 315.0529582583.

Adding to 31271642 its reverse (24617213), we get a palindrome (55888855).

It can be divided in two parts, 31271 and 642, that added together give a palindrome (31913).

The spelling of 31271642 in words is "thirty-one million, two hundred seventy-one thousand, six hundred forty-two".