1191195497 has 2 divisors, whose sum is σ = 1191195498. Its totient is φ = 1191195496.

The previous prime is 1191195487. The next prime is 1191195517. The reversal of 1191195497 is 7945911911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188111961 + 3083536 = 34469^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191195497 - 2⁶ = 1191195433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191195407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595597748 + 595597749.

It is an arithmetic number, because the mean of its divisors is an integer number (595597749).

Almost surely, 2^1191195497 is an apocalyptic number.

It is an amenable number.

1191195497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191195497 is an equidigital number, since it uses as much as digits as its factorization.

1191195497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 47.

The square root of 1191195497 is about 34513.7001348740. The cubic root of 1191195497 is about 1060.0532478888.

The spelling of 1191195497 in words is "one billion, one hundred ninety-one million, one hundred ninety-five thousand, four hundred ninety-seven".