137908981 has 32 divisors (see below), whose sum is σ = 173318400. Its totient is φ = 109283328.

The previous prime is 137908963. The next prime is 137908993. The reversal of 137908981 is 189809731.

It is not a de Polignac number, because 137908981 - 2⁹ = 137908469 is a prime.

It is a super-2 number, since 2×137908981² = 38037774080916722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137908931) 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 31 ways as a sum of consecutive naturals, for example, 390501 + ... + 390853.

It is an arithmetic number, because the mean of its divisors is an integer number (5416200).

Almost surely, 2^137908981 is an apocalyptic number.

It is an amenable number.

137908981 is a deficient number, since it is larger than the sum of its proper divisors (35409419).

137908981 is an equidigital number, since it uses as much as digits as its factorization.

137908981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 137908981 is about 11743.4654595652. The cubic root of 137908981 is about 516.6512881074.

The spelling of 137908981 in words is "one hundred thirty-seven million, nine hundred eight thousand, nine hundred eighty-one".