137004521 has 4 divisors (see below), whose sum is σ = 138004692. Its totient is φ = 136004352.

The previous prime is 137004509. The next prime is 137004533. The reversal of 137004521 is 125400731.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (137004509) and next prime (137004533).

It can be written as a sum of positive squares in 2 ways, for example, as 70744921 + 66259600 = 8411^2 + 8140^2 .

It is a cyclic number.

It is not a de Polignac number, because 137004521 - 2¹⁰ = 137003497 is a prime.

It is a Duffinian number.

137004521 is a modest number, since divided by 4521 gives 137 as remainder.

It is not an unprimeable number, because it can be changed into a prime (137003521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499880 + ... + 500153.

It is an arithmetic number, because the mean of its divisors is an integer number (34501173).

Almost surely, 2^137004521 is an apocalyptic number.

It is an amenable number.

137004521 is a deficient number, since it is larger than the sum of its proper divisors (1000171).

137004521 is a wasteful number, since it uses less digits than its factorization.

137004521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000170.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 137004521 is about 11704.8930366749. The cubic root of 137004521 is about 515.5193441356.

The spelling of 137004521 in words is "one hundred thirty-seven million, four thousand, five hundred twenty-one".