137661239 has 2 divisors, whose sum is σ = 137661240. Its totient is φ = 137661238.

The previous prime is 137661221. The next prime is 137661241. The reversal of 137661239 is 932166731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137661239 is a prime.

Together with 137661241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137661439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68830619 + 68830620.

It is an arithmetic number, because the mean of its divisors is an integer number (68830620).

Almost surely, 2^137661239 is an apocalyptic number.

137661239 is a deficient number, since it is larger than the sum of its proper divisors (1).

137661239 is an equidigital number, since it uses as much as digits as its factorization.

137661239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 137661239 is about 11732.9126392384. The cubic root of 137661239 is about 516.3417289960.

The spelling of 137661239 in words is "one hundred thirty-seven million, six hundred sixty-one thousand, two hundred thirty-nine".