25231405 has 4 divisors (see below), whose sum is σ = 30277692. Its totient is φ = 20185120.

The previous prime is 25231403. The next prime is 25231477. The reversal of 25231405 is 50413252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12974404 + 12257001 = 3602^2 + 3501^2 .

It is not a de Polignac number, because 25231405 - 2¹ = 25231403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25231403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2523136 + ... + 2523145.

It is an arithmetic number, because the mean of its divisors is an integer number (7569423).

Almost surely, 2^25231405 is an apocalyptic number.

It is an amenable number.

25231405 is a deficient number, since it is larger than the sum of its proper divisors (5046287).

25231405 is an equidigital number, since it uses as much as digits as its factorization.

25231405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046286.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 25231405 is about 5023.0871981283. The cubic root of 25231405 is about 293.3011809054.

Adding to 25231405 its reverse (50413252), we get a palindrome (75644657).

The spelling of 25231405 in words is "twenty-five million, two hundred thirty-one thousand, four hundred five".