131698587409 has 3 divisors (see below), whose sum is σ = 131698950313. Its totient is φ = 131698224506.

The previous prime is 131698587379. The next prime is 131698587431. The reversal of 131698587409 is 904785896131.

The square root of 131698587409 is 362903.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 131698587409 - 2⁹ = 131698586897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131698587469) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 181452 + ... + 544354.

Almost surely, 2^131698587409 is an apocalyptic number.

131698587409 is the 362903-rd square number.

131698587409 is the 181452-nd centered octagonal number.

It is an amenable number.

131698587409 is a deficient number, since it is larger than the sum of its proper divisors (362904).

131698587409 is an frugal number, since it uses more digits than its factorization.

131698587409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725806 (or 362903 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 131698587409 in words is "one hundred thirty-one billion, six hundred ninety-eight million, five hundred eighty-seven thousand, four hundred nine".