1171557587 has 2 divisors, whose sum is σ = 1171557588. Its totient is φ = 1171557586.

The previous prime is 1171557577. The next prime is 1171557589. The reversal of 1171557587 is 7857551711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1171557587 - 2⁶ = 1171557523 is a prime.

Together with 1171557589, 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 (1171557589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585778793 + 585778794.

It is an arithmetic number, because the mean of its divisors is an integer number (585778794).

Almost surely, 2^1171557587 is an apocalyptic number.

1171557587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171557587 is an equidigital number, since it uses as much as digits as its factorization.

1171557587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 343000, while the sum is 47.

The square root of 1171557587 is about 34228.0234164931. The cubic root of 1171557587 is about 1054.1956349455.

The spelling of 1171557587 in words is "one billion, one hundred seventy-one million, five hundred fifty-seven thousand, five hundred eighty-seven".