31111001131121 has 4 divisors (see below), whose sum is σ = 31111040108544. Its totient is φ = 31110962153700.

The previous prime is 31111001131109. The next prime is 31111001131141. The reversal of 31111001131121 is 12113110011113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31111001131121 is a prime.

It is a super-2 number, since 2×31111001131121² (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 31111001131121.

It is not an unprimeable number, because it can be changed into a prime (31111001131141) 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, 18265865 + ... + 19896326.

It is an arithmetic number, because the mean of its divisors is an integer number (7777760027136).

Almost surely, 2^{31111001131121} is an apocalyptic number.

It is an amenable number.

31111001131121 is a deficient number, since it is larger than the sum of its proper divisors (38977423).

31111001131121 is an equidigital number, since it uses as much as digits as its factorization.

31111001131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38977422.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 31111001131121 its reverse (12113110011113), we get a palindrome (43224111142234).

The spelling of 31111001131121 in words is "thirty-one trillion, one hundred eleven billion, one million, one hundred thirty-one thousand, one hundred twenty-one".