87911913 has 16 divisors (see below), whose sum is σ = 127141056. Its totient is φ = 53813760.

The previous prime is 87911903. The next prime is 87911921. The reversal of 87911913 is 31911978.

It is not a de Polignac number, because 87911913 - 2⁴ = 87911897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87911903) 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 15 ways as a sum of consecutive naturals, for example, 18931 + ... + 23112.

It is an arithmetic number, because the mean of its divisors is an integer number (7946316).

Almost surely, 2^87911913 is an apocalyptic number.

It is an amenable number.

87911913 is a deficient number, since it is larger than the sum of its proper divisors (39229143).

87911913 is a wasteful number, since it uses less digits than its factorization.

87911913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42104.

The product of its digits is 13608, while the sum is 39.

The square root of 87911913 is about 9376.1352912594. The cubic root of 87911913 is about 444.6475566469.

The spelling of 87911913 in words is "eighty-seven million, nine hundred eleven thousand, nine hundred thirteen".