25220401 has 8 divisors (see below), whose sum is σ = 27625320. Its totient is φ = 22917888.

The previous prime is 25220399. The next prime is 25220417. The reversal of 25220401 is 10402252.

It can be written as a sum of positive squares in 4 ways, for example, as 15610401 + 9610000 = 3951^2 + 3100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25220401 - 2¹ = 25220399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25220431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25086 + ... + 26071.

It is an arithmetic number, because the mean of its divisors is an integer number (3453165).

Almost surely, 2^25220401 is an apocalyptic number.

It is an amenable number.

25220401 is a deficient number, since it is larger than the sum of its proper divisors (2404919).

25220401 is a wasteful number, since it uses less digits than its factorization.

25220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51203.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25220401 is about 5021.9917363532. The cubic root of 25220401 is about 293.2585362264.

Adding to 25220401 its reverse (10402252), we get a palindrome (35622653).

The spelling of 25220401 in words is "twenty-five million, two hundred twenty thousand, four hundred one".