2486781981 has 24 divisors (see below), whose sum is σ = 3811671864. Its totient is φ = 1556904960.

The previous prime is 2486781967. The next prime is 2486781989. The reversal of 2486781981 is 1891876842.

2486781981 is a `hidden beast` number, since 2 + 486 + 7 + 81 + 9 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 35640900 + 2451141081 = 5970^2 + 49509^2 .

It is not a de Polignac number, because 2486781981 - 2⁵ = 2486781949 is a prime.

It is a super-2 number, since 2×2486781981² = 12368169242052568722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2486781989) 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 23 ways as a sum of consecutive naturals, for example, 52905 + ... + 88161.

It is an arithmetic number, because the mean of its divisors is an integer number (158819661).

Almost surely, 2^2486781981 is an apocalyptic number.

It is an amenable number.

2486781981 is a deficient number, since it is larger than the sum of its proper divisors (1324889883).

2486781981 is a wasteful number, since it uses less digits than its factorization.

2486781981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35741 (or 35738 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 2486781981 is about 49867.6446305618. The cubic root of 2486781981 is about 1354.8126320534.

The spelling of 2486781981 in words is "two billion, four hundred eighty-six million, seven hundred eighty-one thousand, nine hundred eighty-one".