87210169 has 2 divisors, whose sum is σ = 87210170. Its totient is φ = 87210168.

The previous prime is 87210113. The next prime is 87210173. The reversal of 87210169 is 96101278.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48832144 + 38378025 = 6988^2 + 6195^2 .

It is a cyclic number.

It is not a de Polignac number, because 87210169 - 2⁷ = 87210041 is a prime.

It is a super-3 number, since 3×87210169³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (87210869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43605084 + 43605085.

It is an arithmetic number, because the mean of its divisors is an integer number (43605085).

Almost surely, 2^87210169 is an apocalyptic number.

It is an amenable number.

87210169 is a deficient number, since it is larger than the sum of its proper divisors (1).

87210169 is an equidigital number, since it uses as much as digits as its factorization.

87210169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 87210169 is about 9338.6384981966. The cubic root of 87210169 is about 443.4612832240.

The spelling of 87210169 in words is "eighty-seven million, two hundred ten thousand, one hundred sixty-nine".