87169851 has 10 divisors (see below), whose sum is σ = 130216812. Its totient is φ = 58113180.

The previous prime is 87169847. The next prime is 87169871. The reversal of 87169851 is 15896178.

It is not a de Polignac number, because 87169851 - 2² = 87169847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87169797 and 87169806.

It is not an unprimeable number, because it can be changed into a prime (87169871) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 538005 + ... + 538166.

Almost surely, 2^87169851 is an apocalyptic number.

87169851 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

87169851 is a deficient number, since it is larger than the sum of its proper divisors (43046961).

87169851 is a wasteful number, since it uses less digits than its factorization.

87169851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076183 (or 1076174 counting only the distinct ones).

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

The square root of 87169851 is about 9336.4795827978. The cubic root of 87169851 is about 443.3929340540.

The spelling of 87169851 in words is "eighty-seven million, one hundred sixty-nine thousand, eight hundred fifty-one".