31311203122 has 16 divisors (see below), whose sum is σ = 47768719680. Its totient is φ = 15388361872.

The previous prime is 31311203107. The next prime is 31311203123. The reversal of 31311203122 is 22130211313.

It is a self number, because there is not a number n which added to its sum of digits gives 31311203122.

It is not an unprimeable number, because it can be changed into a prime (31311203123) 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, 1852803 + ... + 1869625.

It is an arithmetic number, because the mean of its divisors is an integer number (2985544980).

Almost surely, 2^31311203122 is an apocalyptic number.

31311203122 is a deficient number, since it is larger than the sum of its proper divisors (16457516558).

31311203122 is a wasteful number, since it uses less digits than its factorization.

31311203122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32657.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31311203122 its reverse (22130211313), we get a palindrome (53441414435).

The spelling of 31311203122 in words is "thirty-one billion, three hundred eleven million, two hundred three thousand, one hundred twenty-two".