31242005 has 16 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 23392512.

The previous prime is 31241993. The next prime is 31242007. The reversal of 31242005 is 50024213.

It is a cyclic number.

It is not a de Polignac number, because 31242005 - 2⁶ = 31241941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15992 + ... + 17838.

It is an arithmetic number, because the mean of its divisors is an integer number (2494800).

Almost surely, 2^31242005 is an apocalyptic number.

It is an amenable number.

31242005 is a deficient number, since it is larger than the sum of its proper divisors (8674795).

31242005 is a wasteful number, since it uses less digits than its factorization.

31242005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068.

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

The square root of 31242005 is about 5589.4548034670. The cubic root of 31242005 is about 314.9533986659.

Adding to 31242005 its reverse (50024213), we get a palindrome (81266218).

The spelling of 31242005 in words is "thirty-one million, two hundred forty-two thousand, five".