491573143 has 2 divisors, whose sum is σ = 491573144. Its totient is φ = 491573142.

The previous prime is 491573081. The next prime is 491573153. The reversal of 491573143 is 341375194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491573143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491573153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245786571 + 245786572.

It is an arithmetic number, because the mean of its divisors is an integer number (245786572).

Almost surely, 2^491573143 is an apocalyptic number.

491573143 is a deficient number, since it is larger than the sum of its proper divisors (1).

491573143 is an equidigital number, since it uses as much as digits as its factorization.

491573143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 491573143 is about 22171.4488250092. The cubic root of 491573143 is about 789.2163050152.

The spelling of 491573143 in words is "four hundred ninety-one million, five hundred seventy-three thousand, one hundred forty-three".