25216511 has 4 divisors (see below), whose sum is σ = 25237800. Its totient is φ = 25195224.

The previous prime is 25216507. The next prime is 25216567. The reversal of 25216511 is 11561252.

It is a happy number.

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 25216511 - 2² = 25216507 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 (25216571) 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, 8756 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (6309450).

Almost surely, 2^25216511 is an apocalyptic number.

25216511 is a deficient number, since it is larger than the sum of its proper divisors (21289).

25216511 is a wasteful number, since it uses less digits than its factorization.

25216511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21288.

The product of its digits is 600, while the sum is 23.

The square root of 25216511 is about 5021.6044248825. The cubic root of 25216511 is about 293.2434580315.

Adding to 25216511 its reverse (11561252), we get a palindrome (36777763).

The spelling of 25216511 in words is "twenty-five million, two hundred sixteen thousand, five hundred eleven".