31107242 has 4 divisors (see below), whose sum is σ = 46660866. Its totient is φ = 15553620.

The previous prime is 31107239. The next prime is 31107259. The reversal of 31107242 is 24270113.

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., 30129121 + 978121 = 5489^2 + 989^2 .

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 as a sum of consecutive naturals, namely, 7776809 + ... + 7776812.

Almost surely, 2^31107242 is an apocalyptic number.

31107242 is a deficient number, since it is larger than the sum of its proper divisors (15553624).

31107242 is a wasteful number, since it uses less digits than its factorization.

31107242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15553623.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 31107242 is about 5577.3866640211. The cubic root of 31107242 is about 314.4998934219.

Adding to 31107242 its reverse (24270113), we get a palindrome (55377355).

The spelling of 31107242 in words is "thirty-one million, one hundred seven thousand, two hundred forty-two".