87169897 has 4 divisors (see below), whose sum is σ = 92297556. Its totient is φ = 82042240.

The previous prime is 87169883. The next prime is 87169903. The reversal of 87169897 is 79896178.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75411856 + 11758041 = 8684^2 + 3429^2 .

It is a cyclic number.

It is not a de Polignac number, because 87169897 - 2⁷ = 87169769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87169847) 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 3 ways as a sum of consecutive naturals, for example, 2563804 + ... + 2563837.

It is an arithmetic number, because the mean of its divisors is an integer number (23074389).

Almost surely, 2^87169897 is an apocalyptic number.

It is an amenable number.

87169897 is a deficient number, since it is larger than the sum of its proper divisors (5127659).

87169897 is a wasteful number, since it uses less digits than its factorization.

87169897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127658.

The product of its digits is 1524096, while the sum is 55.

The square root of 87169897 is about 9336.4820462528. The cubic root of 87169897 is about 443.3930120476.

The spelling of 87169897 in words is "eighty-seven million, one hundred sixty-nine thousand, eight hundred ninety-seven".