87911219 has 12 divisors (see below), whose sum is σ = 97073448. Its totient is φ = 79608320.

The previous prime is 87911191. The next prime is 87911249. The reversal of 87911219 is 91211978.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a de Polignac number, because none of the positive numbers 2^k-87911219 is a prime.

It is a super-2 number, since 2×87911219² = 15456764852131922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87911249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341939 + ... + 342195.

It is an arithmetic number, because the mean of its divisors is an integer number (8089454).

Almost surely, 2^87911219 is an apocalyptic number.

87911219 is a deficient number, since it is larger than the sum of its proper divisors (9162229).

87911219 is an frugal number, since it uses more digits than its factorization.

87911219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 268 counting only the distinct ones).

The product of its digits is 9072, while the sum is 38.

The square root of 87911219 is about 9376.0982823347. The cubic root of 87911219 is about 444.6463865885.

The spelling of 87911219 in words is "eighty-seven million, nine hundred eleven thousand, two hundred nineteen".