137475621 has 24 divisors (see below), whose sum is σ = 209526720. Its totient is φ = 86619456.

The previous prime is 137475619. The next prime is 137475643. The reversal of 137475621 is 126574731.

It is a happy number.

It is not a de Polignac number, because 137475621 - 2¹ = 137475619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137470621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104856 + ... + 106158.

It is an arithmetic number, because the mean of its divisors is an integer number (8730280).

Almost surely, 2^137475621 is an apocalyptic number.

It is an amenable number.

137475621 is a deficient number, since it is larger than the sum of its proper divisors (72051099).

137475621 is a wasteful number, since it uses less digits than its factorization.

137475621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1942 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 137475621 is about 11724.9998294243. Note that the first 3 decimals coincide. The cubic root of 137475621 is about 516.1095517350.

The spelling of 137475621 in words is "one hundred thirty-seven million, four hundred seventy-five thousand, six hundred twenty-one".