986481205981 has 4 divisors (see below), whose sum is σ = 986483821372. Its totient is φ = 986478590592.

The previous prime is 986481205933. The next prime is 986481206021. The reversal of 986481205981 is 189502184689.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189502184689 = 1693 ⋅111932773.

It can be written as a sum of positive squares in 2 ways, for example, as 588457752100 + 398023453881 = 767110^2 + 630891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-986481205981 is a prime.

It is a super-2 number, since 2×986481205981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (986481235981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622110 + ... + 1536223.

It is an arithmetic number, because the mean of its divisors is an integer number (246620955343).

Almost surely, 2^986481205981 is an apocalyptic number.

It is an amenable number.

986481205981 is a deficient number, since it is larger than the sum of its proper divisors (2615391).

986481205981 is a wasteful number, since it uses less digits than its factorization.

986481205981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615390.

The product of its (nonzero) digits is 9953280, while the sum is 61.

The spelling of 986481205981 in words is "nine hundred eighty-six billion, four hundred eighty-one million, two hundred five thousand, nine hundred eighty-one".