87144919 has 4 divisors (see below), whose sum is σ = 87362640. Its totient is φ = 86927200.

The previous prime is 87144881. The next prime is 87144923. The reversal of 87144919 is 91944178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91944178 = 2 ⋅45972089.

It is a cyclic number.

It is not a de Polignac number, because 87144919 - 2⁷ = 87144791 is a prime.

It is a super-2 number, since 2×87144919² = 15188473815033122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87144929) 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, 108259 + ... + 109060.

It is an arithmetic number, because the mean of its divisors is an integer number (21840660).

Almost surely, 2^87144919 is an apocalyptic number.

87144919 is a deficient number, since it is larger than the sum of its proper divisors (217721).

87144919 is a wasteful number, since it uses less digits than its factorization.

87144919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217720.

The product of its digits is 72576, while the sum is 43.

The square root of 87144919 is about 9335.1442945463. The cubic root of 87144919 is about 443.3506574847.

The spelling of 87144919 in words is "eighty-seven million, one hundred forty-four thousand, nine hundred nineteen".