25217819 has 4 divisors (see below), whose sum is σ = 27510360. Its totient is φ = 22925280.

The previous prime is 25217809. The next prime is 25217833. The reversal of 25217819 is 91871252.

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 25217819 - 2¹² = 25213723 is a prime.

It is a super-2 number, since 2×25217819² = 1271876790233522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25217809) 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, 1146254 + ... + 1146275.

It is an arithmetic number, because the mean of its divisors is an integer number (6877590).

Almost surely, 2^25217819 is an apocalyptic number.

25217819 is a deficient number, since it is larger than the sum of its proper divisors (2292541).

25217819 is a wasteful number, since it uses less digits than its factorization.

25217819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292540.

The product of its digits is 10080, while the sum is 35.

The square root of 25217819 is about 5021.7346604535. The cubic root of 25217819 is about 293.2485281991.

The spelling of 25217819 in words is "twenty-five million, two hundred seventeen thousand, eight hundred nineteen".