137057309 has 4 divisors (see below), whose sum is σ = 138103680. Its totient is φ = 136010940.

The previous prime is 137057273. The next prime is 137057321. The reversal of 137057309 is 903750731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137057309 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 (137057339) 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, 522989 + ... + 523250.

It is an arithmetic number, because the mean of its divisors is an integer number (34525920).

Almost surely, 2^137057309 is an apocalyptic number.

It is an amenable number.

137057309 is a deficient number, since it is larger than the sum of its proper divisors (1046371).

137057309 is a wasteful number, since it uses less digits than its factorization.

137057309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046370.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 137057309 is about 11707.1477739029. The cubic root of 137057309 is about 515.5855456998.

The spelling of 137057309 in words is "one hundred thirty-seven million, fifty-seven thousand, three hundred nine".