137360821 has 4 divisors (see below), whose sum is σ = 147927052. Its totient is φ = 126794592.

The previous prime is 137360813. The next prime is 137360831. The reversal of 137360821 is 128063731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 132020100 = 2311^2 + 11490^2 .

It is a cyclic number.

It is not a de Polignac number, because 137360821 - 2³ = 137360813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137360831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5283096 + ... + 5283121.

It is an arithmetic number, because the mean of its divisors is an integer number (36981763).

Almost surely, 2^137360821 is an apocalyptic number.

It is an amenable number.

137360821 is a deficient number, since it is larger than the sum of its proper divisors (10566231).

137360821 is a wasteful number, since it uses less digits than its factorization.

137360821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566230.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 137360821 is about 11720.1032845278. The cubic root of 137360821 is about 515.9658514048.

The spelling of 137360821 in words is "one hundred thirty-seven million, three hundred sixty thousand, eight hundred twenty-one".