31890110242 has 8 divisors (see below), whose sum is σ = 47909793132. Its totient is φ = 15920179200.

The previous prime is 31890110171. The next prime is 31890110243. The reversal of 31890110242 is 24201109813.

It can be written as a sum of positive squares in 2 ways, for example, as 27419716921 + 4470393321 = 165589^2 + 66861^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31890110243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12436359 + ... + 12438922.

Almost surely, 2^31890110242 is an apocalyptic number.

31890110242 is a deficient number, since it is larger than the sum of its proper divisors (16019682890).

31890110242 is a wasteful number, since it uses less digits than its factorization.

31890110242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24875924.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 31890110242 in words is "thirty-one billion, eight hundred ninety million, one hundred ten thousand, two hundred forty-two".