42543634531 has 2 divisors, whose sum is σ = 42543634532. Its totient is φ = 42543634530.

The previous prime is 42543634519. The next prime is 42543634537. The reversal of 42543634531 is 13543634524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42543634531 - 2¹³ = 42543626339 is a prime.

It is a super-2 number, since 2×42543634531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42543634537) 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, 21271817265 + 21271817266.

It is an arithmetic number, because the mean of its divisors is an integer number (21271817266).

Almost surely, 2^42543634531 is an apocalyptic number.

42543634531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42543634531 is an equidigital number, since it uses as much as digits as its factorization.

42543634531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 40.

The spelling of 42543634531 in words is "forty-two billion, five hundred forty-three million, six hundred thirty-four thousand, five hundred thirty-one".