1317691587 has 8 divisors (see below), whose sum is σ = 1757153104. Its totient is φ = 878345568.

The previous prime is 1317691523. The next prime is 1317691621. The reversal of 1317691587 is 7851967131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1317691587 - 2⁶ = 1317691523 is a prime.

It is a super-2 number, since 2×1317691587² = 3472622236901157138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317691387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2673 + ... + 51405.

It is an arithmetic number, because the mean of its divisors is an integer number (219644138).

Almost surely, 2^1317691587 is an apocalyptic number.

1317691587 is a deficient number, since it is larger than the sum of its proper divisors (439461517).

1317691587 is an equidigital number, since it uses as much as digits as its factorization.

1317691587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57749.

The product of its digits is 317520, while the sum is 48.

The square root of 1317691587 is about 36300.0218594976. The cubic root of 1317691587 is about 1096.3214828829.

The spelling of 1317691587 in words is "one billion, three hundred seventeen million, six hundred ninety-one thousand, five hundred eighty-seven".