987239017 has 2 divisors, whose sum is σ = 987239018. Its totient is φ = 987239016.

The previous prime is 987238961. The next prime is 987239053. The reversal of 987239017 is 710932789.

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., 918332416 + 68906601 = 30304^2 + 8301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987239017 is a prime.

It is not a weakly prime, because it can be changed into another prime (987239917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493619508 + 493619509.

It is an arithmetic number, because the mean of its divisors is an integer number (493619509).

Almost surely, 2^987239017 is an apocalyptic number.

It is an amenable number.

987239017 is a deficient number, since it is larger than the sum of its proper divisors (1).

987239017 is an equidigital number, since it uses as much as digits as its factorization.

987239017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 987239017 is about 31420.3599120061. The cubic root of 987239017 is about 995.7281159929.

The spelling of 987239017 in words is "nine hundred eighty-seven million, two hundred thirty-nine thousand, seventeen".