111887861 has 2 divisors, whose sum is σ = 111887862. Its totient is φ = 111887860.

The previous prime is 111887857. The next prime is 111887873. The reversal of 111887861 is 168788111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88943761 + 22944100 = 9431^2 + 4790^2 .

It is a cyclic number.

It is not a de Polignac number, because 111887861 - 2² = 111887857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111887821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55943930 + 55943931.

It is an arithmetic number, because the mean of its divisors is an integer number (55943931).

Almost surely, 2^111887861 is an apocalyptic number.

It is an amenable number.

111887861 is a deficient number, since it is larger than the sum of its proper divisors (1).

111887861 is an equidigital number, since it uses as much as digits as its factorization.

111887861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 41.

The square root of 111887861 is about 10577.7058476779. The cubic root of 111887861 is about 481.8675235519.

The spelling of 111887861 in words is "one hundred eleven million, eight hundred eighty-seven thousand, eight hundred sixty-one".