31121233201 has 4 divisors (see below), whose sum is σ = 31213581412. Its totient is φ = 31028884992.

The previous prime is 31121233189. The next prime is 31121233249. The reversal of 31121233201 is 10233212113.

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 8703957025 + 22417276176 = 93295^2 + 149724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121233201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121233501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46173600 + ... + 46174273.

It is an arithmetic number, because the mean of its divisors is an integer number (7803395353).

Almost surely, 2^31121233201 is an apocalyptic number.

It is an amenable number.

31121233201 is a deficient number, since it is larger than the sum of its proper divisors (92348211).

31121233201 is an equidigital number, since it uses as much as digits as its factorization.

31121233201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92348210.

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

Adding to 31121233201 its reverse (10233212113), we get a palindrome (41354445314).

The spelling of 31121233201 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred one".