87219893 has 2 divisors, whose sum is σ = 87219894. Its totient is φ = 87219892.

The previous prime is 87219883. The next prime is 87219901. The reversal of 87219893 is 39891278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78446449 + 8773444 = 8857^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 87219893 - 2⁶ = 87219829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87219883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609946 + 43609947.

It is an arithmetic number, because the mean of its divisors is an integer number (43609947).

Almost surely, 2^87219893 is an apocalyptic number.

It is an amenable number.

87219893 is a deficient number, since it is larger than the sum of its proper divisors (1).

87219893 is an equidigital number, since it uses as much as digits as its factorization.

87219893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 87219893 is about 9339.1591163231. The cubic root of 87219893 is about 443.4777647013.

The spelling of 87219893 in words is "eighty-seven million, two hundred nineteen thousand, eight hundred ninety-three".