111523609 has 2 divisors, whose sum is σ = 111523610. Its totient is φ = 111523608.

The previous prime is 111523603. The next prime is 111523613. The reversal of 111523609 is 906325111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 11923209 = 9980^2 + 3453^2 .

It is a cyclic number.

It is not a de Polignac number, because 111523609 - 2²³ = 103135001 is a prime.

It is not a weakly prime, because it can be changed into another prime (111523603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55761804 + 55761805.

It is an arithmetic number, because the mean of its divisors is an integer number (55761805).

Almost surely, 2^111523609 is an apocalyptic number.

It is an amenable number.

111523609 is a deficient number, since it is larger than the sum of its proper divisors (1).

111523609 is an equidigital number, since it uses as much as digits as its factorization.

111523609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 111523609 is about 10560.4739003513. The cubic root of 111523609 is about 481.3440469710.

The spelling of 111523609 in words is "one hundred eleven million, five hundred twenty-three thousand, six hundred nine".