123543631 has 2 divisors, whose sum is σ = 123543632. Its totient is φ = 123543630.

The previous prime is 123543571. The next prime is 123543647. The reversal of 123543631 is 136345321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123543631 - 2¹⁹ = 123019343 is a prime.

It is a super-2 number, since 2×123543631² = 30526057521328322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123543631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123543331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771815 + 61771816.

It is an arithmetic number, because the mean of its divisors is an integer number (61771816).

Almost surely, 2^123543631 is an apocalyptic number.

123543631 is a deficient number, since it is larger than the sum of its proper divisors (1).

123543631 is an equidigital number, since it uses as much as digits as its factorization.

123543631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 123543631 is about 11115.0182635927. The cubic root of 123543631 is about 498.0505840996.

Adding to 123543631 its reverse (136345321), we get a palindrome (259888952).

The spelling of 123543631 in words is "one hundred twenty-three million, five hundred forty-three thousand, six hundred thirty-one".