125440455431 has 2 divisors, whose sum is σ = 125440455432. Its totient is φ = 125440455430.

The previous prime is 125440455421. The next prime is 125440455533. The reversal of 125440455431 is 134554044521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125440455431 - 2¹⁰ = 125440454407 is a prime.

It is a super-2 number, since 2×125440455431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125440455421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62720227715 + 62720227716.

It is an arithmetic number, because the mean of its divisors is an integer number (62720227716).

Almost surely, 2^125440455431 is an apocalyptic number.

125440455431 is a deficient number, since it is larger than the sum of its proper divisors (1).

125440455431 is an equidigital number, since it uses as much as digits as its factorization.

125440455431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 125440455431 its reverse (134554044521), we get a palindrome (259994499952).

The spelling of 125440455431 in words is "one hundred twenty-five billion, four hundred forty million, four hundred fifty-five thousand, four hundred thirty-one".