131781369 has 8 divisors (see below), whose sum is σ = 179794912. Its totient is φ = 85811040.

The previous prime is 131781367. The next prime is 131781439. The reversal of 131781369 is 963187131.

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

It is not a de Polignac number, because 131781369 - 2¹ = 131781367 is a prime.

It is a super-2 number, since 2×131781369² = 34732658431028322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131781367) 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, 510652 + ... + 510909.

It is an arithmetic number, because the mean of its divisors is an integer number (22474364).

Almost surely, 2^131781369 is an apocalyptic number.

It is an amenable number.

131781369 is a deficient number, since it is larger than the sum of its proper divisors (48013543).

131781369 is a wasteful number, since it uses less digits than its factorization.

131781369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021607.

The product of its digits is 27216, while the sum is 39.

The square root of 131781369 is about 11479.6066570244. The cubic root of 131781369 is about 508.8830727642.

The spelling of 131781369 in words is "one hundred thirty-one million, seven hundred eighty-one thousand, three hundred sixty-nine".