1191601 has 2 divisors, whose sum is σ = 1191602. Its totient is φ = 1191600.

The previous prime is 1191577. The next prime is 1191611. The reversal of 1191601 is 1061911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998001 + 193600 = 999^2 + 440^2 .

It is an emirp because it is prime and its reverse (1061911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191601 - 2⁹ = 1191089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595800 + 595801.

It is an arithmetic number, because the mean of its divisors is an integer number (595801).

2^1191601 is an apocalyptic number.

It is an amenable number.

1191601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191601 is an equidigital number, since it uses as much as digits as its factorization.

1191601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1191601 is about 1091.6047819609. The cubic root of 1191601 is about 106.0173520899.

The spelling of 1191601 in words is "one million, one hundred ninety-one thousand, six hundred one".