137660213 has 2 divisors, whose sum is σ = 137660214. Its totient is φ = 137660212.

The previous prime is 137660191. The next prime is 137660279. The reversal of 137660213 is 312066731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91718929 + 45941284 = 9577^2 + 6778^2 .

It is an emirp because it is prime and its reverse (312066731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137660213 - 2⁸ = 137659957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137660113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68830106 + 68830107.

It is an arithmetic number, because the mean of its divisors is an integer number (68830107).

Almost surely, 2^137660213 is an apocalyptic number.

It is an amenable number.

137660213 is a deficient number, since it is larger than the sum of its proper divisors (1).

137660213 is an equidigital number, since it uses as much as digits as its factorization.

137660213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 137660213 is about 11732.8689159983. The cubic root of 137660213 is about 516.3404462143.

The spelling of 137660213 in words is "one hundred thirty-seven million, six hundred sixty thousand, two hundred thirteen".