31211123000201 has 4 divisors (see below), whose sum is σ = 31211624067732. Its totient is φ = 31210621932672.

The previous prime is 31211123000171. The next prime is 31211123000261. The reversal of 31211123000201 is 10200032111213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16022768094025 + 15188354906176 = 4002845^2 + 3897224^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211123000201 - 2¹⁸ = 31211122738057 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 31211123000201.

It is not an unprimeable number, because it can be changed into a prime (31211123000261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250440320 + ... + 250564913.

It is an arithmetic number, because the mean of its divisors is an integer number (7802906016933).

Almost surely, 2^{31211123000201} is an apocalyptic number.

It is an amenable number.

31211123000201 is a deficient number, since it is larger than the sum of its proper divisors (501067531).

31211123000201 is an equidigital number, since it uses as much as digits as its factorization.

31211123000201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501067530.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211123000201 its reverse (10200032111213), we get a palindrome (41411155111414).

The spelling of 31211123000201 in words is "thirty-one trillion, two hundred eleven billion, one hundred twenty-three million, two hundred one", and thus it is an aban number.