87919697 has 2 divisors, whose sum is σ = 87919698. Its totient is φ = 87919696.

The previous prime is 87919673. The next prime is 87919723. The reversal of 87919697 is 79691978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75359761 + 12559936 = 8681^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 87919697 - 2¹² = 87915601 is a prime.

It is not a weakly prime, because it can be changed into another prime (87919397) 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, 43959848 + 43959849.

It is an arithmetic number, because the mean of its divisors is an integer number (43959849).

Almost surely, 2^87919697 is an apocalyptic number.

It is an amenable number.

87919697 is a deficient number, since it is larger than the sum of its proper divisors (1).

87919697 is an equidigital number, since it uses as much as digits as its factorization.

87919697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 87919697 is about 9376.5503784708. The cubic root of 87919697 is about 444.6606797619.

The spelling of 87919697 in words is "eighty-seven million, nine hundred nineteen thousand, six hundred ninety-seven".