87142243 has 2 divisors, whose sum is σ = 87142244. Its totient is φ = 87142242.

The previous prime is 87142213. The next prime is 87142247. The reversal of 87142243 is 34224178.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87142243 is a prime.

It is not a weakly prime, because it can be changed into another prime (87142247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43571121 + 43571122.

It is an arithmetic number, because the mean of its divisors is an integer number (43571122).

Almost surely, 2^87142243 is an apocalyptic number.

87142243 is a deficient number, since it is larger than the sum of its proper divisors (1).

87142243 is an equidigital number, since it uses as much as digits as its factorization.

87142243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 31.

The square root of 87142243 is about 9335.0009641135. Note that the first 3 decimals coincide. The cubic root of 87142243 is about 443.3461193792.

The spelling of 87142243 in words is "eighty-seven million, one hundred forty-two thousand, two hundred forty-three".