87317969 has 2 divisors, whose sum is σ = 87317970. Its totient is φ = 87317968.

The previous prime is 87317953. The next prime is 87317981. The reversal of 87317969 is 96971378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87235600 + 82369 = 9340^2 + 287^2 .

It is a cyclic number.

It is not a de Polignac number, because 87317969 - 2⁴ = 87317953 is a prime.

It is a super-2 number, since 2×87317969² = 15248855420569922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87310969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43658984 + 43658985.

It is an arithmetic number, because the mean of its divisors is an integer number (43658985).

Almost surely, 2^87317969 is an apocalyptic number.

It is an amenable number.

87317969 is a deficient number, since it is larger than the sum of its proper divisors (1).

87317969 is an equidigital number, since it uses as much as digits as its factorization.

87317969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 87317969 is about 9344.4084349947. The cubic root of 87317969 is about 443.6439279896.

The spelling of 87317969 in words is "eighty-seven million, three hundred seventeen thousand, nine hundred sixty-nine".