138096981 has 20 divisors (see below), whose sum is σ = 225048384. Its totient is φ = 83694600.

The previous prime is 138096943. The next prime is 138096989. The reversal of 138096981 is 189690831.

It is not a de Polignac number, because 138096981 - 2¹⁰ = 138095957 is a prime.

It is a super-2 number, since 2×138096981² = 38141552322628722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138096989) 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 19 ways as a sum of consecutive naturals, for example, 76605 + ... + 78386.

Almost surely, 2^138096981 is an apocalyptic number.

138096981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138096981 is a deficient number, since it is larger than the sum of its proper divisors (86951403).

138096981 is a wasteful number, since it uses less digits than its factorization.

138096981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155014 (or 155005 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 138096981 is about 11751.4671849944. The cubic root of 138096981 is about 516.8859509462.

The spelling of 138096981 in words is "one hundred thirty-eight million, ninety-six thousand, nine hundred eighty-one".