137291639 has 2 divisors, whose sum is σ = 137291640. Its totient is φ = 137291638.

The previous prime is 137291617. The next prime is 137291641. The reversal of 137291639 is 936192731.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137291639 is a prime.

It is a Sophie Germain prime.

Together with 137291641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 137291596 and 137291605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137291659) 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 as a sum of consecutive naturals, namely, 68645819 + 68645820.

It is an arithmetic number, because the mean of its divisors is an integer number (68645820).

Almost surely, 2^137291639 is an apocalyptic number.

137291639 is a deficient number, since it is larger than the sum of its proper divisors (1).

137291639 is an equidigital number, since it uses as much as digits as its factorization.

137291639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 41.

The square root of 137291639 is about 11717.1514883098. The cubic root of 137291639 is about 515.8792145126.

The spelling of 137291639 in words is "one hundred thirty-seven million, two hundred ninety-one thousand, six hundred thirty-nine".