137142509 has 4 divisors (see below), whose sum is σ = 156734304. Its totient is φ = 117550716.

The previous prime is 137142497. The next prime is 137142527. The reversal of 137142509 is 905241731.

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 not a de Polignac number, because 137142509 - 2⁴ = 137142493 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 (137142539) 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, 9795887 + ... + 9795900.

It is an arithmetic number, because the mean of its divisors is an integer number (39183576).

Almost surely, 2^137142509 is an apocalyptic number.

It is an amenable number.

137142509 is a deficient number, since it is larger than the sum of its proper divisors (19591795).

137142509 is an equidigital number, since it uses as much as digits as its factorization.

137142509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591794.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 137142509 is about 11710.7860111950. The cubic root of 137142509 is about 515.6923593861.

The spelling of 137142509 in words is "one hundred thirty-seven million, one hundred forty-two thousand, five hundred nine".