31111101122201 has 4 divisors (see below), whose sum is σ = 31159636382004. Its totient is φ = 31062565862400.

The previous prime is 31111101122161. The next prime is 31111101122219. The reversal of 31111101122201 is 10222110111113.

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 29680921920400 + 1430179201801 = 5448020^2 + 1195901^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111101122201 - 2¹⁴ = 31111101105817 is a prime.

It is a super-2 number, since 2×31111101122201² (a number of 28 digits) contains 22 as substring.

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 31111101122201.

It is not an unprimeable number, because it can be changed into a prime (31111101122261) 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, 24267628940 + ... + 24267630221.

It is an arithmetic number, because the mean of its divisors is an integer number (7789909095501).

Almost surely, 2^{31111101122201} is an apocalyptic number.

It is an amenable number.

31111101122201 is a deficient number, since it is larger than the sum of its proper divisors (48535259803).

31111101122201 is an equidigital number, since it uses as much as digits as its factorization.

31111101122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48535259802.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 31111101122201 its reverse (10222110111113), we get a palindrome (41333211233314).

The spelling of 31111101122201 in words is "thirty-one trillion, one hundred eleven billion, one hundred one million, one hundred twenty-two thousand, two hundred one".