25220451 has 4 divisors (see below), whose sum is σ = 33627272. Its totient is φ = 16813632.

The previous prime is 25220449. The next prime is 25220471. The reversal of 25220451 is 15402252.

It is a happy number.

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

It is not a de Polignac number, because 25220451 - 2¹ = 25220449 is a prime.

It is a super-2 number, since 2×25220451² = 1272142297286802, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4203406 + ... + 4203411.

It is an arithmetic number, because the mean of its divisors is an integer number (8406818).

Almost surely, 2^25220451 is an apocalyptic number.

25220451 is a deficient number, since it is larger than the sum of its proper divisors (8406821).

25220451 is an equidigital number, since it uses as much as digits as its factorization.

25220451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8406820.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25220451 is about 5021.9967144553. The cubic root of 25220451 is about 293.2587300234.

The spelling of 25220451 in words is "twenty-five million, two hundred twenty thousand, four hundred fifty-one".