986949450981 has 24 divisors (see below), whose sum is σ = 1588194524280. Its totient is φ = 586410281856.

The previous prime is 986949450973. The next prime is 986949450997. The reversal of 986949450981 is 189054949689.

986949450981 is a `hidden beast` number, since 9 + 8 + 6 + 9 + 494 + 50 + 9 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6548481 + 986942902500 = 2559^2 + 993450^2 .

It is not a de Polignac number, because 986949450981 - 2³ = 986949450973 is a prime.

It is a super-2 number, since 2×986949450981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (986949450911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145435666 + ... + 145442451.

It is an arithmetic number, because the mean of its divisors is an integer number (66174771845).

Almost surely, 2^986949450981 is an apocalyptic number.

It is an amenable number.

986949450981 is a deficient number, since it is larger than the sum of its proper divisors (601245073299).

986949450981 is a wasteful number, since it uses less digits than its factorization.

986949450981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290878165 (or 290878162 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 72.

The spelling of 986949450981 in words is "nine hundred eighty-six billion, nine hundred forty-nine million, four hundred fifty thousand, nine hundred eighty-one".