137912509 has 6 divisors (see below), whose sum is σ = 160428894. Its totient is φ = 118210680.

The previous prime is 137912503. The next prime is 137912527. The reversal of 137912509 is 905219731.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 29127609 = 10430^2 + 5397^2 .

It is not a de Polignac number, because 137912509 - 2²¹ = 135815357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137912503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1407222 + ... + 1407319.

It is an arithmetic number, because the mean of its divisors is an integer number (26738149).

Almost surely, 2^137912509 is an apocalyptic number.

It is an amenable number.

137912509 is a deficient number, since it is larger than the sum of its proper divisors (22516385).

137912509 is an equidigital number, since it uses as much as digits as its factorization.

137912509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814555 (or 2814548 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 137912509 is about 11743.6156698012. The cubic root of 137912509 is about 516.6556937431.

The spelling of 137912509 in words is "one hundred thirty-seven million, nine hundred twelve thousand, five hundred nine".