25321217 has 4 divisors (see below), whose sum is σ = 25432020. Its totient is φ = 25210416.

The previous prime is 25321201. The next prime is 25321237. The reversal of 25321217 is 71212352.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21752896 + 3568321 = 4664^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 25321217 - 2⁴ = 25321201 is a prime.

It is a super-2 number, since 2×25321217² = 1282328060722178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25321192 and 25321201.

It is not an unprimeable number, because it can be changed into a prime (25321237) 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, 55058 + ... + 55515.

It is an arithmetic number, because the mean of its divisors is an integer number (6358005).

Almost surely, 2^25321217 is an apocalyptic number.

It is an amenable number.

25321217 is a deficient number, since it is larger than the sum of its proper divisors (110803).

25321217 is a wasteful number, since it uses less digits than its factorization.

25321217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110802.

The product of its digits is 840, while the sum is 23.

The square root of 25321217 is about 5032.0191772290. The cubic root of 25321217 is about 293.6487738132.

Adding to 25321217 its reverse (71212352), we get a palindrome (96533569).

The spelling of 25321217 in words is "twenty-five million, three hundred twenty-one thousand, two hundred seventeen".