137188981 has 8 divisors (see below), whose sum is σ = 141795584. Its totient is φ = 132593760.

The previous prime is 137188979. The next prime is 137188991. The reversal of 137188981 is 189881731.

137188981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137188981 - 2¹ = 137188979 is a prime.

It is a super-2 number, since 2×137188981² = 37641633015636722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137188901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26686 + ... + 31408.

It is an arithmetic number, because the mean of its divisors is an integer number (17724448).

Almost surely, 2^137188981 is an apocalyptic number.

It is an amenable number.

137188981 is a deficient number, since it is larger than the sum of its proper divisors (4606603).

137188981 is an equidigital number, since it uses as much as digits as its factorization.

137188981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691.

The product of its digits is 96768, while the sum is 46.

The square root of 137188981 is about 11712.7699968880. The cubic root of 137188981 is about 515.7506018403.

The spelling of 137188981 in words is "one hundred thirty-seven million, one hundred eighty-eight thousand, nine hundred eighty-one".