87791559 has 4 divisors (see below), whose sum is σ = 117055416. Its totient is φ = 58527704.

The previous prime is 87791531. The next prime is 87791563. The reversal of 87791559 is 95519778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87791559 - 2¹² = 87787463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87795559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14631924 + ... + 14631929.

It is an arithmetic number, because the mean of its divisors is an integer number (29263854).

Almost surely, 2^87791559 is an apocalyptic number.

87791559 is a deficient number, since it is larger than the sum of its proper divisors (29263857).

87791559 is a wasteful number, since it uses less digits than its factorization.

87791559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29263856.

The product of its digits is 793800, while the sum is 51.

The square root of 87791559 is about 9369.7149903292. The cubic root of 87791559 is about 444.4445521088. Note that the first 3 decimals are identical.

The spelling of 87791559 in words is "eighty-seven million, seven hundred ninety-one thousand, five hundred fifty-nine".