131440643 has 2 divisors, whose sum is σ = 131440644. Its totient is φ = 131440642.

The previous prime is 131440633. The next prime is 131440703. The reversal of 131440643 is 346044131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131440643 - 2⁶ = 131440579 is a prime.

It is not a weakly prime, because it can be changed into another prime (131440633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65720321 + 65720322.

It is an arithmetic number, because the mean of its divisors is an integer number (65720322).

Almost surely, 2^131440643 is an apocalyptic number.

131440643 is a deficient number, since it is larger than the sum of its proper divisors (1).

131440643 is an equidigital number, since it uses as much as digits as its factorization.

131440643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 131440643 is about 11464.7565608695. The cubic root of 131440643 is about 508.4441150534. Note that the first 3 decimals are identical.

Adding to 131440643 its reverse (346044131), we get a palindrome (477484774).

The spelling of 131440643 in words is "one hundred thirty-one million, four hundred forty thousand, six hundred forty-three".