137748517 has 2 divisors, whose sum is σ = 137748518. Its totient is φ = 137748516.

The previous prime is 137748509. The next prime is 137748571. The reversal of 137748517 is 715847731.

It is a happy number.

Together with next prime (137748571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 1185921 = 11686^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 137748517 - 2³ = 137748509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137748217) 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, 68874258 + 68874259.

It is an arithmetic number, because the mean of its divisors is an integer number (68874259).

Almost surely, 2^137748517 is an apocalyptic number.

It is an amenable number.

137748517 is a deficient number, since it is larger than the sum of its proper divisors (1).

137748517 is an equidigital number, since it uses as much as digits as its factorization.

137748517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 43.

The square root of 137748517 is about 11736.6314162114. The cubic root of 137748517 is about 516.4508271300.

It can be divided in two parts, 1377 and 48517, that added together give a palindrome (49894).

The spelling of 137748517 in words is "one hundred thirty-seven million, seven hundred forty-eight thousand, five hundred seventeen".