25431215429 has 2 divisors, whose sum is σ = 25431215430. Its totient is φ = 25431215428.

The previous prime is 25431215423. The next prime is 25431215449. The reversal of 25431215429 is 92451213452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21180436225 + 4250779204 = 145535^2 + 65198^2 .

It is a cyclic number.

It is not a de Polignac number, because 25431215429 - 2⁴ = 25431215413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25431215392 and 25431215401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25431215423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715607714 + 12715607715.

It is an arithmetic number, because the mean of its divisors is an integer number (12715607715).

Almost surely, 2^25431215429 is an apocalyptic number.

It is an amenable number.

25431215429 is a deficient number, since it is larger than the sum of its proper divisors (1).

25431215429 is an equidigital number, since it uses as much as digits as its factorization.

25431215429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The spelling of 25431215429 in words is "twenty-five billion, four hundred thirty-one million, two hundred fifteen thousand, four hundred twenty-nine".