111245551 has 4 divisors (see below), whose sum is σ = 117100600. Its totient is φ = 105390504.

The previous prime is 111245543. The next prime is 111245567. The reversal of 111245551 is 155542111.

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 111245551 - 2³ = 111245543 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 (111245591) 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, 2927496 + ... + 2927533.

It is an arithmetic number, because the mean of its divisors is an integer number (29275150).

Almost surely, 2^111245551 is an apocalyptic number.

111245551 is a deficient number, since it is larger than the sum of its proper divisors (5855049).

111245551 is an equidigital number, since it uses as much as digits as its factorization.

111245551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855048.

The product of its digits is 1000, while the sum is 25.

The square root of 111245551 is about 10547.3006499293. The cubic root of 111245551 is about 480.9436744916.

Adding to 111245551 its reverse (155542111), we get a palindrome (266787662).

The spelling of 111245551 in words is "one hundred eleven million, two hundred forty-five thousand, five hundred fifty-one".