111601691 has 2 divisors, whose sum is σ = 111601692. Its totient is φ = 111601690.

The previous prime is 111601673. The next prime is 111601709. The reversal of 111601691 is 196106111.

It is a balanced prime because it is at equal distance from previous prime (111601673) and next prime (111601709). It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 169109111 and 111901961.

It is a cyclic number.

It is not a de Polignac number, because 111601691 - 2¹⁰ = 111600667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111601691.

It is not a weakly prime, because it can be changed into another prime (111601601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55800845 + 55800846.

It is an arithmetic number, because the mean of its divisors is an integer number (55800846).

Almost surely, 2^111601691 is an apocalyptic number.

111601691 is a deficient number, since it is larger than the sum of its proper divisors (1).

111601691 is an equidigital number, since it uses as much as digits as its factorization.

111601691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 111601691 is about 10564.1701519807. The cubic root of 111601691 is about 481.4563566372.

The spelling of 111601691 in words is "one hundred eleven million, six hundred one thousand, six hundred ninety-one".