25550401 has 4 divisors (see below), whose sum is σ = 26661312. Its totient is φ = 24439492.

The previous prime is 25550381. The next prime is 25550407. The reversal of 25550401 is 10405552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25550401 - 2²¹ = 23453249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25550407) 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, 555421 + ... + 555466.

It is an arithmetic number, because the mean of its divisors is an integer number (6665328).

Almost surely, 2^25550401 is an apocalyptic number.

It is an amenable number.

25550401 is a deficient number, since it is larger than the sum of its proper divisors (1110911).

25550401 is a wasteful number, since it uses less digits than its factorization.

25550401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110910.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 25550401 is about 5054.7404483316. The cubic root of 25550401 is about 294.5320590448.

Adding to 25550401 its reverse (10405552), we get a palindrome (35955953).

The spelling of 25550401 in words is "twenty-five million, five hundred fifty thousand, four hundred one".