981865487 has 4 divisors (see below), whose sum is σ = 987006336. Its totient is φ = 976724640.

The previous prime is 981865471. The next prime is 981865517. The reversal of 981865487 is 784568189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784568189 = 223 ⋅3518243.

It is a cyclic number.

It is not a de Polignac number, because 981865487 - 2⁴ = 981865471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981865187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570138 + ... + 2570519.

It is an arithmetic number, because the mean of its divisors is an integer number (246751584).

Almost surely, 2^981865487 is an apocalyptic number.

981865487 is a deficient number, since it is larger than the sum of its proper divisors (5140849).

981865487 is a wasteful number, since it uses less digits than its factorization.

981865487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140848.

The product of its digits is 3870720, while the sum is 56.

The square root of 981865487 is about 31334.7329173235. The cubic root of 981865487 is about 993.9182496291.

The spelling of 981865487 in words is "nine hundred eighty-one million, eight hundred sixty-five thousand, four hundred eighty-seven".