111692561 has 2 divisors, whose sum is σ = 111692562. Its totient is φ = 111692560.

The previous prime is 111692527. The next prime is 111692573. The reversal of 111692561 is 165296111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110145025 + 1547536 = 10495^2 + 1244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111692561 is a prime.

It is not a weakly prime, because it can be changed into another prime (111692521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55846280 + 55846281.

It is an arithmetic number, because the mean of its divisors is an integer number (55846281).

Almost surely, 2^111692561 is an apocalyptic number.

It is an amenable number.

111692561 is a deficient number, since it is larger than the sum of its proper divisors (1).

111692561 is an equidigital number, since it uses as much as digits as its factorization.

111692561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 32.

The square root of 111692561 is about 10568.4701352656. The cubic root of 111692561 is about 481.5869940551.

The spelling of 111692561 in words is "one hundred eleven million, six hundred ninety-two thousand, five hundred sixty-one".