25551403 has 4 divisors (see below), whose sum is σ = 25600968. Its totient is φ = 25501840.

The previous prime is 25551389. The next prime is 25551431. The reversal of 25551403 is 30415552.

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

It is a cyclic number.

It is not a de Polignac number, because 25551403 - 2¹⁷ = 25420331 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (25551443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24001 + ... + 25042.

It is an arithmetic number, because the mean of its divisors is an integer number (6400242).

Almost surely, 2^25551403 is an apocalyptic number.

25551403 is a deficient number, since it is larger than the sum of its proper divisors (49565).

25551403 is an equidigital number, since it uses as much as digits as its factorization.

25551403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49564.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 25551403 is about 5054.8395622413. The cubic root of 25551403 is about 294.5359091770.

Adding to 25551403 its reverse (30415552), we get a palindrome (55966955).

The spelling of 25551403 in words is "twenty-five million, five hundred fifty-one thousand, four hundred three".