111664601 has 2 divisors, whose sum is σ = 111664602. Its totient is φ = 111664600.

The previous prime is 111664583. The next prime is 111664603. The reversal of 111664601 is 106466111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 2253001 = 10460^2 + 1501^2 .

It is a cyclic number.

It is not a de Polignac number, because 111664601 - 2⁶ = 111664537 is a prime.

Together with 111664603, 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 (111664603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55832300 + 55832301.

It is an arithmetic number, because the mean of its divisors is an integer number (55832301).

Almost surely, 2^111664601 is an apocalyptic number.

It is an amenable number.

111664601 is a deficient number, since it is larger than the sum of its proper divisors (1).

111664601 is an equidigital number, since it uses as much as digits as its factorization.

111664601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 111664601 is about 10567.1472498494. The cubic root of 111664601 is about 481.5468054756.

The spelling of 111664601 in words is "one hundred eleven million, six hundred sixty-four thousand, six hundred one".