161131543 has 2 divisors, whose sum is σ = 161131544. Its totient is φ = 161131542.

The previous prime is 161131519. The next prime is 161131567. The reversal of 161131543 is 345131161.

161131543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (161131519) and next prime (161131567).

It is a cyclic number.

It is not a de Polignac number, because 161131543 - 2¹³ = 161123351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161131573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80565771 + 80565772.

It is an arithmetic number, because the mean of its divisors is an integer number (80565772).

Almost surely, 2^161131543 is an apocalyptic number.

161131543 is a deficient number, since it is larger than the sum of its proper divisors (1).

161131543 is an equidigital number, since it uses as much as digits as its factorization.

161131543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 161131543 is about 12693.7600024579. The cubic root of 161131543 is about 544.1603016182.

The spelling of 161131543 in words is "one hundred sixty-one million, one hundred thirty-one thousand, five hundred forty-three".