31205242 has 4 divisors (see below), whose sum is σ = 46807866. Its totient is φ = 15602620.

The previous prime is 31205233. The next prime is 31205243. The reversal of 31205242 is 24250213.

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., 15689521 + 15515721 = 3961^2 + 3939^2 .

It is not an unprimeable number, because it can be changed into a prime (31205243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7801309 + ... + 7801312.

Almost surely, 2^31205242 is an apocalyptic number.

31205242 is a deficient number, since it is larger than the sum of its proper divisors (15602624).

31205242 is a wasteful number, since it uses less digits than its factorization.

31205242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15602623.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31205242 is about 5586.1652320711. The cubic root of 31205242 is about 314.8298131666.

Adding to 31205242 its reverse (24250213), we get a palindrome (55455455).

The spelling of 31205242 in words is "thirty-one million, two hundred five thousand, two hundred forty-two".