18542487631 has 2 divisors, whose sum is σ = 18542487632. Its totient is φ = 18542487630.

The previous prime is 18542487589. The next prime is 18542487637. The reversal of 18542487631 is 13678424581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18542487631 is a prime.

It is a super-2 number, since 2×18542487631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18542487637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9271243815 + 9271243816.

It is an arithmetic number, because the mean of its divisors is an integer number (9271243816).

Almost surely, 2^18542487631 is an apocalyptic number.

18542487631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18542487631 is an equidigital number, since it uses as much as digits as its factorization.

18542487631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The spelling of 18542487631 in words is "eighteen billion, five hundred forty-two million, four hundred eighty-seven thousand, six hundred thirty-one".