31172642 has 8 divisors (see below), whose sum is σ = 47322576. Its totient is φ = 15398452.

The previous prime is 31172633. The next prime is 31172657. The reversal of 31172642 is 24627113.

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

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, 93728 + ... + 94059.

It is an arithmetic number, because the mean of its divisors is an integer number (5915322).

Almost surely, 2^31172642 is an apocalyptic number.

31172642 is a deficient number, since it is larger than the sum of its proper divisors (16149934).

31172642 is a wasteful number, since it uses less digits than its factorization.

31172642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187872.

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

The square root of 31172642 is about 5583.2465465892. The cubic root of 31172642 is about 314.7201411223.

Adding to 31172642 its reverse (24627113), we get a palindrome (55799755).

The spelling of 31172642 in words is "thirty-one million, one hundred seventy-two thousand, six hundred forty-two".