87197161 has 2 divisors, whose sum is σ = 87197162. Its totient is φ = 87197160.

The previous prime is 87197087. The next prime is 87197183. The reversal of 87197161 is 16179178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87067561 + 129600 = 9331^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 87197161 - 2¹¹ = 87195113 is a prime.

It is not a weakly prime, because it can be changed into another prime (87197861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43598580 + 43598581.

It is an arithmetic number, because the mean of its divisors is an integer number (43598581).

Almost surely, 2^87197161 is an apocalyptic number.

It is an amenable number.

87197161 is a deficient number, since it is larger than the sum of its proper divisors (1).

87197161 is an equidigital number, since it uses as much as digits as its factorization.

87197161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The square root of 87197161 is about 9337.9420109572. The cubic root of 87197161 is about 443.4392336883.

The spelling of 87197161 in words is "eighty-seven million, one hundred ninety-seven thousand, one hundred sixty-one".