87019873 has 2 divisors, whose sum is σ = 87019874. Its totient is φ = 87019872.

The previous prime is 87019871. The next prime is 87019901. The reversal of 87019873 is 37891078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84033889 + 2985984 = 9167^2 + 1728^2 .

It is a cyclic number.

It is not a de Polignac number, because 87019873 - 2¹ = 87019871 is a prime.

It is a super-2 number, since 2×87019873² = 15144916593872258, which contains 22 as substring.

Together with 87019871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87019871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43509936 + 43509937.

It is an arithmetic number, because the mean of its divisors is an integer number (43509937).

Almost surely, 2^87019873 is an apocalyptic number.

It is an amenable number.

87019873 is a deficient number, since it is larger than the sum of its proper divisors (1).

87019873 is an equidigital number, since it uses as much as digits as its factorization.

87019873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 87019873 is about 9328.4442968804. Note that the first 3 decimals coincide. The cubic root of 87019873 is about 443.1384983783.

The spelling of 87019873 in words is "eighty-seven million, nineteen thousand, eight hundred seventy-three".