87511423 has 4 divisors (see below), whose sum is σ = 87562288. Its totient is φ = 87460560.

The previous prime is 87511399. The next prime is 87511429. The reversal of 87511423 is 32411578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32411578 = 2 ⋅16205789.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87511423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87511429) 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 3 ways as a sum of consecutive naturals, for example, 22758 + ... + 26323.

It is an arithmetic number, because the mean of its divisors is an integer number (21890572).

Almost surely, 2^87511423 is an apocalyptic number.

87511423 is a deficient number, since it is larger than the sum of its proper divisors (50865).

87511423 is a wasteful number, since it uses less digits than its factorization.

87511423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50864.

The product of its digits is 6720, while the sum is 31.

The square root of 87511423 is about 9354.7540320417. The cubic root of 87511423 is about 443.9713191305.

The spelling of 87511423 in words is "eighty-seven million, five hundred eleven thousand, four hundred twenty-three".