87815671 has 2 divisors, whose sum is σ = 87815672. Its totient is φ = 87815670.

The previous prime is 87815669. The next prime is 87815699. The reversal of 87815671 is 17651878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87815671 - 2¹ = 87815669 is a prime.

Together with 87815669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87815471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43907835 + 43907836.

It is an arithmetic number, because the mean of its divisors is an integer number (43907836).

Almost surely, 2^87815671 is an apocalyptic number.

87815671 is a deficient number, since it is larger than the sum of its proper divisors (1).

87815671 is an equidigital number, since it uses as much as digits as its factorization.

87815671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 43.

The square root of 87815671 is about 9371.0016006828. The cubic root of 87815671 is about 444.4852373645.

The spelling of 87815671 in words is "eighty-seven million, eight hundred fifteen thousand, six hundred seventy-one".