137615809 has 2 divisors, whose sum is σ = 137615810. Its totient is φ = 137615808.

The previous prime is 137615773. The next prime is 137615843. The reversal of 137615809 is 908516731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 7997584 = 11385^2 + 2828^2 .

It is an emirp because it is prime and its reverse (908516731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137615809 is a prime.

It is a super-2 number, since 2×137615809² = 37876221773448962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137615869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68807904 + 68807905.

It is an arithmetic number, because the mean of its divisors is an integer number (68807905).

Almost surely, 2^137615809 is an apocalyptic number.

It is an amenable number.

137615809 is a deficient number, since it is larger than the sum of its proper divisors (1).

137615809 is an equidigital number, since it uses as much as digits as its factorization.

137615809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 137615809 is about 11730.9764725704. The cubic root of 137615809 is about 516.2849229170.

The spelling of 137615809 in words is "one hundred thirty-seven million, six hundred fifteen thousand, eight hundred nine".