31000400422 has 16 divisors (see below), whose sum is σ = 49284208512. Its totient is φ = 14574119040.

The previous prime is 31000400363. The next prime is 31000400423. The reversal of 31000400422 is 22400400013.

It is a super-2 number, since 2×31000400422² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000400396 and 31000400405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000400423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411798 + ... + 481225.

It is an arithmetic number, because the mean of its divisors is an integer number (3080263032).

Almost surely, 2^31000400422 is an apocalyptic number.

31000400422 is a deficient number, since it is larger than the sum of its proper divisors (18283808090).

31000400422 is a wasteful number, since it uses less digits than its factorization.

31000400422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894063.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 31000400422 its reverse (22400400013), we get a palindrome (53400800435).

The spelling of 31000400422 in words is "thirty-one billion, four hundred thousand, four hundred twenty-two".