25551242 has 4 divisors (see below), whose sum is σ = 38326866. Its totient is φ = 12775620.

The previous prime is 25551217. The next prime is 25551263. The reversal of 25551242 is 24215552.

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

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 8814961 = 4091^2 + 2969^2 .

It is a super-3 number, since 3×25551242³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6387809 + ... + 6387812.

Almost surely, 2^25551242 is an apocalyptic number.

25551242 is a deficient number, since it is larger than the sum of its proper divisors (12775624).

25551242 is a wasteful number, since it uses less digits than its factorization.

25551242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12775623.

The product of its digits is 4000, while the sum is 26.

The square root of 25551242 is about 5054.8236368839. The cubic root of 25551242 is about 294.5352905498.

Adding to 25551242 its reverse (24215552), we get a palindrome (49766794).

The spelling of 25551242 in words is "twenty-five million, five hundred fifty-one thousand, two hundred forty-two".