87051899 has 4 divisors (see below), whose sum is σ = 94965720. Its totient is φ = 79138080.

The previous prime is 87051857. The next prime is 87051931. The reversal of 87051899 is 99815078.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87051899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87051199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3956894 + ... + 3956915.

It is an arithmetic number, because the mean of its divisors is an integer number (23741430).

Almost surely, 2^87051899 is an apocalyptic number.

87051899 is a deficient number, since it is larger than the sum of its proper divisors (7913821).

87051899 is a wasteful number, since it uses less digits than its factorization.

87051899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7913820.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 87051899 is about 9330.1607167294. The cubic root of 87051899 is about 443.1928545937.

The spelling of 87051899 in words is "eighty-seven million, fifty-one thousand, eight hundred ninety-nine".