125123435531 has 2 divisors, whose sum is σ = 125123435532. Its totient is φ = 125123435530.

The previous prime is 125123435509. The next prime is 125123435561. The reversal of 125123435531 is 135534321521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125123435531 - 2¹⁸ = 125123173387 is a prime.

It is a super-2 number, since 2×125123435531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125123435491 and 125123435500.

It is not a weakly prime, because it can be changed into another prime (125123435561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62561717765 + 62561717766.

It is an arithmetic number, because the mean of its divisors is an integer number (62561717766).

Almost surely, 2^125123435531 is an apocalyptic number.

125123435531 is a deficient number, since it is larger than the sum of its proper divisors (1).

125123435531 is an equidigital number, since it uses as much as digits as its factorization.

125123435531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 35.

The spelling of 125123435531 in words is "one hundred twenty-five billion, one hundred twenty-three million, four hundred thirty-five thousand, five hundred thirty-one".