131647785481 has 8 divisors (see below), whose sum is σ = 131844650184. Its totient is φ = 131451070080.

The previous prime is 131647785469. The next prime is 131647785499. The reversal of 131647785481 is 184587746131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26934061456 + 104713724025 = 164116^2 + 323595^2 .

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 131647785481 - 2¹⁵ = 131647752713 is a prime.

It is a super-2 number, since 2×131647785481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131647785421) 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, 1793971 + ... + 1865911.

It is an arithmetic number, because the mean of its divisors is an integer number (16480581273).

Almost surely, 2^131647785481 is an apocalyptic number.

It is an amenable number.

131647785481 is a deficient number, since it is larger than the sum of its proper divisors (196864703).

131647785481 is a wasteful number, since it uses less digits than its factorization.

131647785481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74651.

The product of its digits is 4515840, while the sum is 55.

The spelling of 131647785481 in words is "one hundred thirty-one billion, six hundred forty-seven million, seven hundred eighty-five thousand, four hundred eighty-one".