137521943 has 8 divisors (see below), whose sum is σ = 155895600. Its totient is φ = 120261888.

The previous prime is 137521927. The next prime is 137521961. The reversal of 137521943 is 349125731.

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 137521943 - 2⁴ = 137521927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137521963) 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 7 ways as a sum of consecutive naturals, for example, 278138 + ... + 278631.

It is an arithmetic number, because the mean of its divisors is an integer number (19486950).

Almost surely, 2^137521943 is an apocalyptic number.

137521943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

137521943 is a deficient number, since it is larger than the sum of its proper divisors (18373657).

137521943 is a wasteful number, since it uses less digits than its factorization.

137521943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556801.

The product of its digits is 22680, while the sum is 35.

The square root of 137521943 is about 11726.9750148962. The cubic root of 137521943 is about 516.1675124164.

The spelling of 137521943 in words is "one hundred thirty-seven million, five hundred twenty-one thousand, nine hundred forty-three".