31031213201 has 4 divisors (see below), whose sum is σ = 31032947892. Its totient is φ = 31029478512.

The previous prime is 31031213179. The next prime is 31031213251. The reversal of 31031213201 is 10231213013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10231213013 = 7 ⋅1461601859.

It can be written as a sum of positive squares in 2 ways, for example, as 26463480976 + 4567732225 = 162676^2 + 67585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031213201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031213201.

It is not an unprimeable number, because it can be changed into a prime (31031213251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840230 + ... + 876383.

It is an arithmetic number, because the mean of its divisors is an integer number (7758236973).

Almost surely, 2^31031213201 is an apocalyptic number.

It is an amenable number.

31031213201 is a deficient number, since it is larger than the sum of its proper divisors (1734691).

31031213201 is a wasteful number, since it uses less digits than its factorization.

31031213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734690.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31031213201 its reverse (10231213013), we get a palindrome (41262426214).

The spelling of 31031213201 in words is "thirty-one billion, thirty-one million, two hundred thirteen thousand, two hundred one".