25216429 has 6 divisors (see below), whose sum is σ = 29333454. Its totient is φ = 21614040.

The previous prime is 25216421. The next prime is 25216453. The reversal of 25216429 is 92461252.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 4831204 = 4515^2 + 2198^2 .

It is not a de Polignac number, because 25216429 - 2³ = 25216421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25216429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 257262 + ... + 257359.

It is an arithmetic number, because the mean of its divisors is an integer number (4888909).

Almost surely, 2^25216429 is an apocalyptic number.

It is an amenable number.

25216429 is a deficient number, since it is larger than the sum of its proper divisors (4117025).

25216429 is an equidigital number, since it uses as much as digits as its factorization.

25216429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514635 (or 514628 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 25216429 is about 5021.5962601547. The cubic root of 25216429 is about 293.2431401711.

The spelling of 25216429 in words is "twenty-five million, two hundred sixteen thousand, four hundred twenty-nine".