631045543 has 2 divisors, whose sum is σ = 631045544. Its totient is φ = 631045542.

The previous prime is 631045501. The next prime is 631045567. The reversal of 631045543 is 345540136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631045543 - 2⁹ = 631045031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631045573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315522771 + 315522772.

It is an arithmetic number, because the mean of its divisors is an integer number (315522772).

Almost surely, 2^631045543 is an apocalyptic number.

631045543 is a deficient number, since it is larger than the sum of its proper divisors (1).

631045543 is an equidigital number, since it uses as much as digits as its factorization.

631045543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 631045543 is about 25120.6198769059. The cubic root of 631045543 is about 857.7358611361.

Adding to 631045543 its reverse (345540136), we get a palindrome (976585679).

The spelling of 631045543 in words is "six hundred thirty-one million, forty-five thousand, five hundred forty-three".