31040242 has 4 divisors (see below), whose sum is σ = 46560366. Its totient is φ = 15520120.

The previous prime is 31040231. The next prime is 31040293. The reversal of 31040242 is 24204013.

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., 30702681 + 337561 = 5541^2 + 581^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7760059 + ... + 7760062.

Almost surely, 2^31040242 is an apocalyptic number.

31040242 is a deficient number, since it is larger than the sum of its proper divisors (15520124).

31040242 is a wasteful number, since it uses less digits than its factorization.

31040242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15520123.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31040242 is about 5571.3770290656. The cubic root of 31040242 is about 314.2739370439.

Adding to 31040242 its reverse (24204013), we get a palindrome (55244255).

The spelling of 31040242 in words is "thirty-one million, forty thousand, two hundred forty-two".