123000431531 has 2 divisors, whose sum is σ = 123000431532. Its totient is φ = 123000431530.

The previous prime is 123000431507. The next prime is 123000431611. The reversal of 123000431531 is 135134000321.

It is a weak prime.

It is an emirp because it is prime and its reverse (135134000321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123000431531 is a prime.

It is a super-2 number, since 2×123000431531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123000431497 and 123000431506.

It is not a weakly prime, because it can be changed into another prime (123000431131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61500215765 + 61500215766.

It is an arithmetic number, because the mean of its divisors is an integer number (61500215766).

Almost surely, 2^123000431531 is an apocalyptic number.

123000431531 is a deficient number, since it is larger than the sum of its proper divisors (1).

123000431531 is an equidigital number, since it uses as much as digits as its factorization.

123000431531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 123000431531 its reverse (135134000321), we get a palindrome (258134431852).

The spelling of 123000431531 in words is "one hundred twenty-three billion, four hundred thirty-one thousand, five hundred thirty-one".