87641317 has 2 divisors, whose sum is σ = 87641318. Its totient is φ = 87641316.

The previous prime is 87641299. The next prime is 87641347. The reversal of 87641317 is 71314678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87628321 + 12996 = 9361^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 87641317 - 2⁷ = 87641189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87641347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43820658 + 43820659.

It is an arithmetic number, because the mean of its divisors is an integer number (43820659).

Almost surely, 2^87641317 is an apocalyptic number.

It is an amenable number.

87641317 is a deficient number, since it is larger than the sum of its proper divisors (1).

87641317 is an equidigital number, since it uses as much as digits as its factorization.

87641317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 87641317 is about 9361.6941308718. The cubic root of 87641317 is about 444.1908740910.

The spelling of 87641317 in words is "eighty-seven million, six hundred forty-one thousand, three hundred seventeen".