137521945 has 24 divisors (see below), whose sum is σ = 189298368. Its totient is φ = 95657760.

The previous prime is 137521927. The next prime is 137521961. The reversal of 137521945 is 549125731.

It is not a de Polignac number, because 137521945 - 2¹¹ = 137519897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8974 + ... + 18856.

It is an arithmetic number, because the mean of its divisors is an integer number (7887432).

Almost surely, 2^137521945 is an apocalyptic number.

It is an amenable number.

137521945 is a deficient number, since it is larger than the sum of its proper divisors (51776423).

137521945 is a wasteful number, since it uses less digits than its factorization.

137521945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9933 (or 9922 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 137521945 is about 11726.9751001697. The cubic root of 137521945 is about 516.1675149186.

The spelling of 137521945 in words is "one hundred thirty-seven million, five hundred twenty-one thousand, nine hundred forty-five".