123125440531 has 2 divisors, whose sum is σ = 123125440532. Its totient is φ = 123125440530.

The previous prime is 123125440513. The next prime is 123125440589. The reversal of 123125440531 is 135044521321.

Together with previous prime (123125440513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123125440531 - 2⁵ = 123125440499 is a prime.

It is a super-2 number, since 2×123125440531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123125440493 and 123125440502.

It is not a weakly prime, because it can be changed into another prime (123125440591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61562720265 + 61562720266.

It is an arithmetic number, because the mean of its divisors is an integer number (61562720266).

Almost surely, 2^123125440531 is an apocalyptic number.

123125440531 is a deficient number, since it is larger than the sum of its proper divisors (1).

123125440531 is an equidigital number, since it uses as much as digits as its factorization.

123125440531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 123125440531 its reverse (135044521321), we get a palindrome (258169961852).

The spelling of 123125440531 in words is "one hundred twenty-three billion, one hundred twenty-five million, four hundred forty thousand, five hundred thirty-one".