111142551 has 8 divisors (see below), whose sum is σ = 159589360. Its totient is φ = 68395392.

The previous prime is 111142547. The next prime is 111142553. The reversal of 111142551 is 155241111.

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

It is not a de Polignac number, because 111142551 - 2² = 111142547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111142553) 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, 1424866 + ... + 1424943.

It is an arithmetic number, because the mean of its divisors is an integer number (19948670).

Almost surely, 2^111142551 is an apocalyptic number.

111142551 is a deficient number, since it is larger than the sum of its proper divisors (48446809).

111142551 is a wasteful number, since it uses less digits than its factorization.

111142551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849825.

The product of its digits is 200, while the sum is 21.

The square root of 111142551 is about 10542.4167532876. The cubic root of 111142551 is about 480.7951966592.

Adding to 111142551 its reverse (155241111), we get a palindrome (266383662).

The spelling of 111142551 in words is "one hundred eleven million, one hundred forty-two thousand, five hundred fifty-one".