887091561 has 8 divisors (see below), whose sum is σ = 1314209760. Its totient is φ = 591394356.

The previous prime is 887091559. The next prime is 887091563. The reversal of 887091561 is 165190788.

887091561 is a `hidden beast` number, since 8 + 87 + 0 + 9 + 1 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (887091559) and next prime (887091563).

It is not a de Polignac number, because 887091561 - 2¹ = 887091559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (887091563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16427595 + ... + 16427648.

It is an arithmetic number, because the mean of its divisors is an integer number (164276220).

Almost surely, 2^887091561 is an apocalyptic number.

It is an amenable number.

887091561 is a deficient number, since it is larger than the sum of its proper divisors (427118199).

887091561 is a wasteful number, since it uses less digits than its factorization.

887091561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32855252 (or 32855246 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 887091561 is about 29784.0823427548. The cubic root of 887091561 is about 960.8512274195.

The spelling of 887091561 in words is "eight hundred eighty-seven million, ninety-one thousand, five hundred sixty-one".