131243643 has 12 divisors (see below), whose sum is σ = 190623888. Its totient is φ = 87011280.

The previous prime is 131243641. The next prime is 131243653. The reversal of 131243643 is 346342131.

131243643 is a `hidden beast` number, since 1 + 3 + 12 + 4 + 3 + 643 = 666.

It is not a de Polignac number, because 131243643 - 2¹ = 131243641 is a prime.

It is a super-2 number, since 2×131243643² = 34449787655822898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131243641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38655 + ... + 41912.

It is an arithmetic number, because the mean of its divisors is an integer number (15885324).

Almost surely, 2^131243643 is an apocalyptic number.

131243643 is a deficient number, since it is larger than the sum of its proper divisors (59380245).

131243643 is a wasteful number, since it uses less digits than its factorization.

131243643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80754 (or 80751 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 131243643 is about 11456.1617918044. The cubic root of 131243643 is about 508.1899735364.

Adding to 131243643 its reverse (346342131), we get a palindrome (477585774).

The spelling of 131243643 in words is "one hundred thirty-one million, two hundred forty-three thousand, six hundred forty-three".