137816909 has 4 divisors (see below), whose sum is σ = 145923804. Its totient is φ = 129710016.

The previous prime is 137816891. The next prime is 137816953. The reversal of 137816909 is 909618731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57714409 + 80102500 = 7597^2 + 8950^2 .

It is a cyclic number.

It is not a de Polignac number, because 137816909 - 2¹² = 137812813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137816909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137816969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4053422 + ... + 4053455.

It is an arithmetic number, because the mean of its divisors is an integer number (36480951).

Almost surely, 2^137816909 is an apocalyptic number.

It is an amenable number.

137816909 is a deficient number, since it is larger than the sum of its proper divisors (8106895).

137816909 is an equidigital number, since it uses as much as digits as its factorization.

137816909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106894.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 137816909 is about 11739.5446674903. The cubic root of 137816909 is about 516.5362854268.

The spelling of 137816909 in words is "one hundred thirty-seven million, eight hundred sixteen thousand, nine hundred nine".