25551442 has 40 divisors (see below), whose sum is σ = 47493756. Its totient is φ = 10273536.

The previous prime is 25551431. The next prime is 25551443. The reversal of 25551442 is 24415552.

It can be written as a sum of positive squares in 2 ways, for example, as 24492601 + 1058841 = 4949^2 + 1029^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25551442.

It is not an unprimeable number, because it can be changed into a prime (25551443) 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 19 ways as a sum of consecutive naturals, for example, 81478 + ... + 81790.

Almost surely, 2^25551442 is an apocalyptic number.

25551442 is a deficient number, since it is larger than the sum of its proper divisors (21942314).

25551442 is an equidigital number, since it uses as much as digits as its factorization.

25551442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 339 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 25551442 is about 5054.8434199290. The cubic root of 25551442 is about 294.5360590305.

Adding to 25551442 its reverse (24415552), we get a palindrome (49966994).

The spelling of 25551442 in words is "twenty-five million, five hundred fifty-one thousand, four hundred forty-two".