81887134149 has 24 divisors (see below), whose sum is σ = 122381850240. Its totient is φ = 52699584672.

The previous prime is 81887134139. The next prime is 81887134169. The reversal of 81887134149 is 94143178818.

81887134149 is a `hidden beast` number, since 81 + 88 + 71 + 3 + 414 + 9 = 666.

It is not a de Polignac number, because 81887134149 - 2¹¹ = 81887132101 is a prime.

It is a super-3 number, since 3×81887134149³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81887134095 and 81887134104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81887134139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1630792 + ... + 1680254.

It is an arithmetic number, because the mean of its divisors is an integer number (5099243760).

Almost surely, 2^81887134149 is an apocalyptic number.

It is an amenable number.

81887134149 is a deficient number, since it is larger than the sum of its proper divisors (40494716091).

81887134149 is a wasteful number, since it uses less digits than its factorization.

81887134149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55841 (or 55838 counting only the distinct ones).

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

The spelling of 81887134149 in words is "eighty-one billion, eight hundred eighty-seven million, one hundred thirty-four thousand, one hundred forty-nine".