31121120201 has 4 divisors (see below), whose sum is σ = 31121572500. Its totient is φ = 31120667904.

The previous prime is 31121120197. The next prime is 31121120263. The reversal of 31121120201 is 10202112113.

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 4438224400 + 26682895801 = 66620^2 + 163349^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121120201 - 2² = 31121120197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121120501) 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, 99176 + ... + 268473.

It is an arithmetic number, because the mean of its divisors is an integer number (7780393125).

Almost surely, 2^31121120201 is an apocalyptic number.

It is an amenable number.

31121120201 is a deficient number, since it is larger than the sum of its proper divisors (452299).

31121120201 is an equidigital number, since it uses as much as digits as its factorization.

31121120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452298.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31121120201 its reverse (10202112113), we get a palindrome (41323232314).

The spelling of 31121120201 in words is "thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred one".