137908649 has 2 divisors, whose sum is σ = 137908650. Its totient is φ = 137908648.

The previous prime is 137908637. The next prime is 137908651. The reversal of 137908649 is 946809731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 37908649 = 10000^2 + 6157^2 .

It is a cyclic number.

It is not a de Polignac number, because 137908649 - 2⁴ = 137908633 is a prime.

Together with 137908651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137908679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68954324 + 68954325.

It is an arithmetic number, because the mean of its divisors is an integer number (68954325).

Almost surely, 2^137908649 is an apocalyptic number.

It is an amenable number.

137908649 is a deficient number, since it is larger than the sum of its proper divisors (1).

137908649 is an equidigital number, since it uses as much as digits as its factorization.

137908649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 137908649 is about 11743.4513240359. The cubic root of 137908649 is about 516.6508735142.

The spelling of 137908649 in words is "one hundred thirty-seven million, nine hundred eight thousand, six hundred forty-nine".