25128229 has 6 divisors (see below), whose sum is σ = 29230854. Its totient is φ = 21538440.

The previous prime is 25128223. The next prime is 25128263. The reversal of 25128229 is 92282152.

It can be written as a sum of positive squares in only one way, i.e., 24980004 + 148225 = 4998^2 + 385^2 .

It is not a de Polignac number, because 25128229 - 2⁷ = 25128101 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 25128229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25128223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256362 + ... + 256459.

It is an arithmetic number, because the mean of its divisors is an integer number (4871809).

Almost surely, 2^25128229 is an apocalyptic number.

It is an amenable number.

25128229 is a deficient number, since it is larger than the sum of its proper divisors (4102625).

25128229 is an equidigital number, since it uses as much as digits as its factorization.

25128229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512835 (or 512828 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 25128229 is about 5012.8064993574. The cubic root of 25128229 is about 292.9008466773.

The spelling of 25128229 in words is "twenty-five million, one hundred twenty-eight thousand, two hundred twenty-nine".