87219247 has 2 divisors, whose sum is σ = 87219248. Its totient is φ = 87219246.

The previous prime is 87219241. The next prime is 87219271. The reversal of 87219247 is 74291278.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87219247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87219241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609623 + 43609624.

It is an arithmetic number, because the mean of its divisors is an integer number (43609624).

Almost surely, 2^87219247 is an apocalyptic number.

87219247 is a deficient number, since it is larger than the sum of its proper divisors (1).

87219247 is an equidigital number, since it uses as much as digits as its factorization.

87219247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 87219247 is about 9339.1245307041. The cubic root of 87219247 is about 443.4766698160.

The spelling of 87219247 in words is "eighty-seven million, two hundred nineteen thousand, two hundred forty-seven".