870687509 has 2 divisors, whose sum is σ = 870687510. Its totient is φ = 870687508.

The previous prime is 870687497. The next prime is 870687511. The reversal of 870687509 is 905786078.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677560900 + 193126609 = 26030^2 + 13897^2 .

It is a cyclic number.

It is not a de Polignac number, because 870687509 - 2⁸ = 870687253 is a prime.

Together with 870687511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870687529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435343754 + 435343755.

It is an arithmetic number, because the mean of its divisors is an integer number (435343755).

Almost surely, 2^870687509 is an apocalyptic number.

It is an amenable number.

870687509 is a deficient number, since it is larger than the sum of its proper divisors (1).

870687509 is an equidigital number, since it uses as much as digits as its factorization.

870687509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 870687509 is about 29507.4144750095. The cubic root of 870687509 is about 954.8916697749.

The spelling of 870687509 in words is "eight hundred seventy million, six hundred eighty-seven thousand, five hundred nine".