87164881 has 2 divisors, whose sum is σ = 87164882. Its totient is φ = 87164880.

The previous prime is 87164867. The next prime is 87164897. The reversal of 87164881 is 18846178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72846225 + 14318656 = 8535^2 + 3784^2 .

It is a cyclic number.

It is not a de Polignac number, because 87164881 - 2⁹ = 87164369 is a prime.

It is a super-2 number, since 2×87164881² = 15195432959488322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87164801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43582440 + 43582441.

It is an arithmetic number, because the mean of its divisors is an integer number (43582441).

Almost surely, 2^87164881 is an apocalyptic number.

It is an amenable number.

87164881 is a deficient number, since it is larger than the sum of its proper divisors (1).

87164881 is an equidigital number, since it uses as much as digits as its factorization.

87164881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 87164881 is about 9336.2134187260. The cubic root of 87164881 is about 443.3845071926.

The spelling of 87164881 in words is "eighty-seven million, one hundred sixty-four thousand, eight hundred eighty-one".