111220005431 has 4 divisors (see below), whose sum is σ = 111556017864. Its totient is φ = 110883993000.

The previous prime is 111220005389. The next prime is 111220005439. The reversal of 111220005431 is 134500022111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111220005431 - 2¹⁰ = 111220004407 is a prime.

It is a super-2 number, since 2×111220005431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220005439) 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, 168005720 + ... + 168006381.

It is an arithmetic number, because the mean of its divisors is an integer number (27889004466).

Almost surely, 2^111220005431 is an apocalyptic number.

111220005431 is a deficient number, since it is larger than the sum of its proper divisors (336012433).

111220005431 is an equidigital number, since it uses as much as digits as its factorization.

111220005431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336012432.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 111220005431 its reverse (134500022111), we get a palindrome (245720027542).

The spelling of 111220005431 in words is "one hundred eleven billion, two hundred twenty million, five thousand, four hundred thirty-one".