111211431155 has 8 divisors (see below), whose sum is σ = 145585873584. Its totient is φ = 80881040800.

The previous prime is 111211431139. The next prime is 111211431157. The reversal of 111211431155 is 551134112111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111211431155 - 2⁴ = 111211431139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111211431157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011012956 + ... + 1011013065.

It is an arithmetic number, because the mean of its divisors is an integer number (18198234198).

Almost surely, 2^111211431155 is an apocalyptic number.

111211431155 is a deficient number, since it is larger than the sum of its proper divisors (34374442429).

111211431155 is a wasteful number, since it uses less digits than its factorization.

111211431155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022026037.

The product of its digits is 600, while the sum is 26.

Adding to 111211431155 its reverse (551134112111), we get a palindrome (662345543266).

The spelling of 111211431155 in words is "one hundred eleven billion, two hundred eleven million, four hundred thirty-one thousand, one hundred fifty-five".