31191242 has 16 divisors (see below), whose sum is σ = 48839112. Its totient is φ = 14926080.

The previous prime is 31191227. The next prime is 31191257. The reversal of 31191242 is 24219113.

It is an interprime number because it is at equal distance from previous prime (31191227) and next prime (31191257).

It can be written as a sum of positive squares in 4 ways, for example, as 28504921 + 2686321 = 5339^2 + 1639^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758 + ... + 7934.

Almost surely, 2^31191242 is an apocalyptic number.

31191242 is a deficient number, since it is larger than the sum of its proper divisors (17647870).

31191242 is a wasteful number, since it uses less digits than its factorization.

31191242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7273.

The product of its digits is 432, while the sum is 23.

The square root of 31191242 is about 5584.9119957256. The cubic root of 31191242 is about 314.7827241049.

The spelling of 31191242 in words is "thirty-one million, one hundred ninety-one thousand, two hundred forty-two".