137806609 has 2 divisors, whose sum is σ = 137806610. Its totient is φ = 137806608.

The previous prime is 137806597. The next prime is 137806633. The reversal of 137806609 is 906608731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136960209 + 846400 = 11703^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 137806609 - 2⁵ = 137806577 is a prime.

It is a super-2 number, since 2×137806609² = 37981322968157762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (137806649) 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, 68903304 + 68903305.

It is an arithmetic number, because the mean of its divisors is an integer number (68903305).

Almost surely, 2^137806609 is an apocalyptic number.

It is an amenable number.

137806609 is a deficient number, since it is larger than the sum of its proper divisors (1).

137806609 is an equidigital number, since it uses as much as digits as its factorization.

137806609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 137806609 is about 11739.1059710695. The cubic root of 137806609 is about 516.5234170100.

The spelling of 137806609 in words is "one hundred thirty-seven million, eight hundred six thousand, six hundred nine".