111971749 has 2 divisors, whose sum is σ = 111971750. Its totient is φ = 111971748.

The previous prime is 111971747. The next prime is 111971753. The reversal of 111971749 is 947179111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 38526849 = 8570^2 + 6207^2 .

It is a cyclic number.

It is not a de Polignac number, because 111971749 - 2¹ = 111971747 is a prime.

Together with 111971747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111971747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55985874 + 55985875.

It is an arithmetic number, because the mean of its divisors is an integer number (55985875).

Almost surely, 2^111971749 is an apocalyptic number.

It is an amenable number.

111971749 is a deficient number, since it is larger than the sum of its proper divisors (1).

111971749 is an equidigital number, since it uses as much as digits as its factorization.

111971749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 40.

The square root of 111971749 is about 10581.6704257882. The cubic root of 111971749 is about 481.9879203024.

The spelling of 111971749 in words is "one hundred eleven million, nine hundred seventy-one thousand, seven hundred forty-nine".