87890197 has 2 divisors, whose sum is σ = 87890198. Its totient is φ = 87890196.

The previous prime is 87890167. The next prime is 87890227. The reversal of 87890197 is 79109878.

It is a balanced prime because it is at equal distance from previous prime (87890167) and next prime (87890227).

It can be written as a sum of positive squares in only one way, i.e., 77898276 + 9991921 = 8826^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 87890197 - 2⁷ = 87890069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87890197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87890137) 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, 43945098 + 43945099.

It is an arithmetic number, because the mean of its divisors is an integer number (43945099).

Almost surely, 2^87890197 is an apocalyptic number.

It is an amenable number.

87890197 is a deficient number, since it is larger than the sum of its proper divisors (1).

87890197 is an equidigital number, since it uses as much as digits as its factorization.

87890197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 87890197 is about 9374.9771733055. The cubic root of 87890197 is about 444.6109413533.

The spelling of 87890197 in words is "eighty-seven million, eight hundred ninety thousand, one hundred ninety-seven".