131115509 has 8 divisors (see below), whose sum is σ = 158660928. Its totient is φ = 105773760.

The previous prime is 131115493. The next prime is 131115511. The reversal of 131115509 is 905511131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131115509 - 2⁴ = 131115493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131115529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550787 + ... + 551024.

It is an arithmetic number, because the mean of its divisors is an integer number (19832616).

Almost surely, 2^131115509 is an apocalyptic number.

It is an amenable number.

131115509 is a deficient number, since it is larger than the sum of its proper divisors (27545419).

131115509 is a wasteful number, since it uses less digits than its factorization.

131115509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101835.

The product of its (nonzero) digits is 675, while the sum is 26.

The square root of 131115509 is about 11450.5680645110. The cubic root of 131115509 is about 508.0245366556.

The spelling of 131115509 in words is "one hundred thirty-one million, one hundred fifteen thousand, five hundred nine".