137039509 has 2 divisors, whose sum is σ = 137039510. Its totient is φ = 137039508.

The previous prime is 137039459. The next prime is 137039519. The reversal of 137039509 is 905930731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135140625 + 1898884 = 11625^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 137039509 - 2¹³ = 137031317 is a prime.

It is a super-2 number, since 2×137039509² = 37559654053922162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137039519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68519754 + 68519755.

It is an arithmetic number, because the mean of its divisors is an integer number (68519755).

Almost surely, 2^137039509 is an apocalyptic number.

It is an amenable number.

137039509 is a deficient number, since it is larger than the sum of its proper divisors (1).

137039509 is an equidigital number, since it uses as much as digits as its factorization.

137039509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 137039509 is about 11706.3875298915. The cubic root of 137039509 is about 515.5632245747.

The spelling of 137039509 in words is "one hundred thirty-seven million, thirty-nine thousand, five hundred nine".