137229521 has 12 divisors (see below), whose sum is σ = 162108720. Its totient is φ = 115156080.

The previous prime is 137229511. The next prime is 137229539. The reversal of 137229521 is 125922731.

137229521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 137229521 - 2²⁶ = 70120657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137229511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35051 + ... + 38768.

It is an arithmetic number, because the mean of its divisors is an integer number (13509060).

Almost surely, 2^137229521 is an apocalyptic number.

137229521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

137229521 is a deficient number, since it is larger than the sum of its proper divisors (24879199).

137229521 is a wasteful number, since it uses less digits than its factorization.

137229521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73856 (or 73843 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 137229521 is about 11714.5004588331. The cubic root of 137229521 is about 515.8013990935.

The spelling of 137229521 in words is "one hundred thirty-seven million, two hundred twenty-nine thousand, five hundred twenty-one".