87215143 has 2 divisors, whose sum is σ = 87215144. Its totient is φ = 87215142.

The previous prime is 87215123. The next prime is 87215153. The reversal of 87215143 is 34151278.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87215143 is a prime.

It is equal to p_5064970 and since 87215143 and 5064970 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87215113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43607571 + 43607572.

It is an arithmetic number, because the mean of its divisors is an integer number (43607572).

Almost surely, 2^87215143 is an apocalyptic number.

87215143 is a deficient number, since it is larger than the sum of its proper divisors (1).

87215143 is an equidigital number, since it uses as much as digits as its factorization.

87215143 is an odious number, because the sum of its binary digits is odd.

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

The square root of 87215143 is about 9338.9048073101. The cubic root of 87215143 is about 443.4697139476.

The spelling of 87215143 in words is "eighty-seven million, two hundred fifteen thousand, one hundred forty-three".