25220413 has 4 divisors (see below), whose sum is σ = 25230528. Its totient is φ = 25210300.

The previous prime is 25220399. The next prime is 25220417. The reversal of 25220413 is 31402252.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25220413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220417) 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, 1638 + ... + 7288.

It is an arithmetic number, because the mean of its divisors is an integer number (6307632).

Almost surely, 2^25220413 is an apocalyptic number.

It is an amenable number.

25220413 is a deficient number, since it is larger than the sum of its proper divisors (10115).

25220413 is an equidigital number, since it uses as much as digits as its factorization.

25220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10114.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25220413 is about 5021.9929310982. The cubic root of 25220413 is about 293.2585827377.

Adding to 25220413 its reverse (31402252), we get a palindrome (56622665).

The spelling of 25220413 in words is "twenty-five million, two hundred twenty thousand, four hundred thirteen".