137688739 has 2 divisors, whose sum is σ = 137688740. Its totient is φ = 137688738.

The previous prime is 137688737. The next prime is 137688743. The reversal of 137688739 is 937886731.

It is a happy number.

137688739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (937886731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137688739 - 2¹ = 137688737 is a prime.

Together with 137688737, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (137688737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68844369 + 68844370.

It is an arithmetic number, because the mean of its divisors is an integer number (68844370).

Almost surely, 2^137688739 is an apocalyptic number.

137688739 is a deficient number, since it is larger than the sum of its proper divisors (1).

137688739 is an equidigital number, since it uses as much as digits as its factorization.

137688739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 137688739 is about 11734.0844977356. The cubic root of 137688739 is about 516.3761091702.

The spelling of 137688739 in words is "one hundred thirty-seven million, six hundred eighty-eight thousand, seven hundred thirty-nine".