987491689 has 8 divisors (see below), whose sum is σ = 1017244800. Its totient is φ = 958047216.

The previous prime is 987491677. The next prime is 987491711. The reversal of 987491689 is 986194789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987491689 - 2¹⁷ = 987360617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987491629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70657 + ... + 83470.

It is an arithmetic number, because the mean of its divisors is an integer number (127155600).

Almost surely, 2^987491689 is an apocalyptic number.

It is an amenable number.

987491689 is a deficient number, since it is larger than the sum of its proper divisors (29753111).

987491689 is a wasteful number, since it uses less digits than its factorization.

987491689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154319.

The product of its digits is 7838208, while the sum is 61.

The square root of 987491689 is about 31424.3804871313. The cubic root of 987491689 is about 995.8130569745.

The spelling of 987491689 in words is "nine hundred eighty-seven million, four hundred ninety-one thousand, six hundred eighty-nine".