25511983 has 4 divisors (see below), whose sum is σ = 29156560. Its totient is φ = 21867408.

The previous prime is 25511957. The next prime is 25511987. The reversal of 25511983 is 38911552.

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 25511983 - 2¹⁷ = 25380911 is a prime.

It is a super-2 number, since 2×25511983² = 1301722553184578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25511987) 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, 1822278 + ... + 1822291.

It is an arithmetic number, because the mean of its divisors is an integer number (7289140).

Almost surely, 2^25511983 is an apocalyptic number.

25511983 is a deficient number, since it is larger than the sum of its proper divisors (3644577).

25511983 is an equidigital number, since it uses as much as digits as its factorization.

25511983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644576.

The product of its digits is 10800, while the sum is 34.

The square root of 25511983 is about 5050.9388236248. The cubic root of 25511983 is about 294.3843639240.

The spelling of 25511983 in words is "twenty-five million, five hundred eleven thousand, nine hundred eighty-three".