987072509 has 2 divisors, whose sum is σ = 987072510. Its totient is φ = 987072508.

The previous prime is 987072473. The next prime is 987072517. The reversal of 987072509 is 905270789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 951907609 + 35164900 = 30853^2 + 5930^2 .

It is a cyclic number.

It is not a de Polignac number, because 987072509 - 2¹⁶ = 987006973 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987072589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493536254 + 493536255.

It is an arithmetic number, because the mean of its divisors is an integer number (493536255).

Almost surely, 2^987072509 is an apocalyptic number.

It is an amenable number.

987072509 is a deficient number, since it is larger than the sum of its proper divisors (1).

987072509 is an equidigital number, since it uses as much as digits as its factorization.

987072509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 987072509 is about 31417.7101170661. The cubic root of 987072509 is about 995.6721329208.

The spelling of 987072509 in words is "nine hundred eighty-seven million, seventy-two thousand, five hundred nine".