111242501 has 2 divisors, whose sum is σ = 111242502. Its totient is φ = 111242500.

The previous prime is 111242497. The next prime is 111242503. The reversal of 111242501 is 105242111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100020001 + 11222500 = 10001^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 111242501 - 2² = 111242497 is a prime.

Together with 111242503, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111242501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111242503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55621250 + 55621251.

It is an arithmetic number, because the mean of its divisors is an integer number (55621251).

Almost surely, 2^111242501 is an apocalyptic number.

It is an amenable number.

111242501 is a deficient number, since it is larger than the sum of its proper divisors (1).

111242501 is an equidigital number, since it uses as much as digits as its factorization.

111242501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 111242501 is about 10547.1560621809. The cubic root of 111242501 is about 480.9392791350.

Adding to 111242501 its reverse (105242111), we get a palindrome (216484612).

The spelling of 111242501 in words is "one hundred eleven million, two hundred forty-two thousand, five hundred one".