31005242 has 16 divisors (see below), whose sum is σ = 49565952. Its totient is φ = 14512080.

The previous prime is 31005241. The next prime is 31005287. The reversal of 31005242 is 24250013.

It is a super-2 number, since 2×31005242² = 1922650062957128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31005242.

It is not an unprimeable number, because it can be changed into a prime (31005241) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 5009 + ... + 9332.

It is an arithmetic number, because the mean of its divisors is an integer number (3097872).

Almost surely, 2^31005242 is an apocalyptic number.

31005242 is a deficient number, since it is larger than the sum of its proper divisors (18560710).

31005242 is a wasteful number, since it uses less digits than its factorization.

31005242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14413.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31005242 is about 5568.2350884279. The cubic root of 31005242 is about 314.1557708190.

Adding to 31005242 its reverse (24250013), we get a palindrome (55255255).

The spelling of 31005242 in words is "thirty-one million, five thousand, two hundred forty-two".