1191175061 has 2 divisors, whose sum is σ = 1191175062. Its totient is φ = 1191175060.

The previous prime is 1191175049. The next prime is 1191175099. The reversal of 1191175061 is 1605711911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925680625 + 265494436 = 30425^2 + 16294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191175061 - 2⁶ = 1191174997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191175361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595587530 + 595587531.

It is an arithmetic number, because the mean of its divisors is an integer number (595587531).

Almost surely, 2^1191175061 is an apocalyptic number.

It is an amenable number.

1191175061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191175061 is an equidigital number, since it uses as much as digits as its factorization.

1191175061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 32.

The square root of 1191175061 is about 34513.4040772567. The cubic root of 1191175061 is about 1060.0471858074.

Adding to 1191175061 its reverse (1605711911), we get a palindrome (2796886972).

The spelling of 1191175061 in words is "one billion, one hundred ninety-one million, one hundred seventy-five thousand, sixty-one".