31111020233201 has 4 divisors (see below), whose sum is σ = 31210416464292. Its totient is φ = 31011624002112.

The previous prime is 31111020233177. The next prime is 31111020233219. The reversal of 31111020233201 is 10233202011113.

It is a happy number.

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 4386762691600 + 26724257541601 = 2094460^2 + 5169551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31111020233201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31111020233261) 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, 49698115076 + ... + 49698115701.

It is an arithmetic number, because the mean of its divisors is an integer number (7802604116073).

Almost surely, 2^{31111020233201} is an apocalyptic number.

It is an amenable number.

31111020233201 is a deficient number, since it is larger than the sum of its proper divisors (99396231091).

31111020233201 is an equidigital number, since it uses as much as digits as its factorization.

31111020233201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99396231090.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31111020233201 its reverse (10233202011113), we get a palindrome (41344222244314).

The spelling of 31111020233201 in words is "thirty-one trillion, one hundred eleven billion, twenty million, two hundred thirty-three thousand, two hundred one".