31500042242 has 8 divisors (see below), whose sum is σ = 49304414016. Its totient is φ = 15065237572.

The previous prime is 31500042227. The next prime is 31500042281. The reversal of 31500042242 is 24224000513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×31500042242² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342391718 + ... + 342391809.

It is an arithmetic number, because the mean of its divisors is an integer number (6163051752).

Almost surely, 2^31500042242 is an apocalyptic number.

31500042242 is a deficient number, since it is larger than the sum of its proper divisors (17804371774).

31500042242 is a wasteful number, since it uses less digits than its factorization.

31500042242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684783552.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 31500042242 its reverse (24224000513), we get a palindrome (55724042755).

The spelling of 31500042242 in words is "thirty-one billion, five hundred million, forty-two thousand, two hundred forty-two".