31240042002 has 24 divisors (see below), whose sum is σ = 72893431884. Its totient is φ = 9612320544.

The previous prime is 31240041991. The next prime is 31240042051. The reversal of 31240042002 is 20024004213.

31240042002 is a `hidden beast` number, since 3 + 1 + 240 + 0 + 420 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25772770521 + 5467271481 = 160539^2 + 73941^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66751993 + ... + 66752460.

Almost surely, 2^31240042002 is an apocalyptic number.

31240042002 is an abundant number, since it is smaller than the sum of its proper divisors (41653389882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31240042002 is a wasteful number, since it uses less digits than its factorization.

31240042002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133504474 (or 133504471 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31240042002 its reverse (20024004213), we get a palindrome (51264046215).

The spelling of 31240042002 in words is "thirty-one billion, two hundred forty million, forty-two thousand, two".