137728531 has 4 divisors (see below), whose sum is σ = 143716752. Its totient is φ = 131740312.

The previous prime is 137728529. The next prime is 137728559. The reversal of 137728531 is 135827731.

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

It is a cyclic number.

It is not a de Polignac number, because 137728531 - 2¹ = 137728529 is a prime.

It is a super-2 number, since 2×137728531² = 37938296502835922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137728561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2994076 + ... + 2994121.

It is an arithmetic number, because the mean of its divisors is an integer number (35929188).

Almost surely, 2^137728531 is an apocalyptic number.

137728531 is a deficient number, since it is larger than the sum of its proper divisors (5988221).

137728531 is an equidigital number, since it uses as much as digits as its factorization.

137728531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5988220.

The product of its digits is 35280, while the sum is 37.

The square root of 137728531 is about 11735.7799485164. The cubic root of 137728531 is about 516.4258485538.

The spelling of 137728531 in words is "one hundred thirty-seven million, seven hundred twenty-eight thousand, five hundred thirty-one".