31222400231 has 16 divisors (see below), whose sum is σ = 35488171008. Its totient is φ = 27211641600.

The previous prime is 31222400213. The next prime is 31222400263. The reversal of 31222400231 is 13200422213.

It is not a de Polignac number, because 31222400231 - 2¹⁰ = 31222399207 is a prime.

It is a super-2 number, since 2×31222400231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222402231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391370 + ... + 464343.

It is an arithmetic number, because the mean of its divisors is an integer number (2218010688).

Almost surely, 2^31222400231 is an apocalyptic number.

31222400231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31222400231 is a deficient number, since it is larger than the sum of its proper divisors (4265770777).

31222400231 is a wasteful number, since it uses less digits than its factorization.

31222400231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855862.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31222400231 its reverse (13200422213), we get a palindrome (44422822444).

The spelling of 31222400231 in words is "thirty-one billion, two hundred twenty-two million, four hundred thousand, two hundred thirty-one".