1191195487 has 2 divisors, whose sum is σ = 1191195488. Its totient is φ = 1191195486.

The previous prime is 1191195463. The next prime is 1191195497. The reversal of 1191195487 is 7845911911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191195487 - 2²³ = 1182806879 is a prime.

It is a congruent number.

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, 595597743 + 595597744.

It is an arithmetic number, because the mean of its divisors is an integer number (595597744).

Almost surely, 2^1191195487 is an apocalyptic number.

1191195487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191195487 is an equidigital number, since it uses as much as digits as its factorization.

1191195487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 46.

The square root of 1191195487 is about 34513.6999900040. The cubic root of 1191195487 is about 1060.0532449224.

The spelling of 1191195487 in words is "one billion, one hundred ninety-one million, one hundred ninety-five thousand, four hundred eighty-seven".