111552409 has 2 divisors, whose sum is σ = 111552410. Its totient is φ = 111552408.

The previous prime is 111552407. The next prime is 111552433. The reversal of 111552409 is 904255111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111513600 + 38809 = 10560^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 111552409 - 2¹ = 111552407 is a prime.

Together with 111552407, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111552407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55776204 + 55776205.

It is an arithmetic number, because the mean of its divisors is an integer number (55776205).

Almost surely, 2^111552409 is an apocalyptic number.

It is an amenable number.

111552409 is a deficient number, since it is larger than the sum of its proper divisors (1).

111552409 is an equidigital number, since it uses as much as digits as its factorization.

111552409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 111552409 is about 10561.8373875003. The cubic root of 111552409 is about 481.3854777065.

The spelling of 111552409 in words is "one hundred eleven million, five hundred fifty-two thousand, four hundred nine".