31312040442 has 16 divisors (see below), whose sum is σ = 63074615520. Its totient is φ = 10362257712.

The previous prime is 31312040437. The next prime is 31312040443. The reversal of 31312040442 is 24404021313.

It is not an unprimeable number, because it can be changed into a prime (31312040443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18771373 + ... + 18773040.

It is an arithmetic number, because the mean of its divisors is an integer number (3942163470).

Almost surely, 2^31312040442 is an apocalyptic number.

31312040442 is an abundant number, since it is smaller than the sum of its proper divisors (31762575078).

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

31312040442 is a wasteful number, since it uses less digits than its factorization.

31312040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37544557.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31312040442 its reverse (24404021313), we get a palindrome (55716061755).

The spelling of 31312040442 in words is "thirty-one billion, three hundred twelve million, forty thousand, four hundred forty-two".