25286406289 has 3 divisors (see below), whose sum is σ = 25286565307. Its totient is φ = 25286247272.

The previous prime is 25286406281. The next prime is 25286406293. The reversal of 25286406289 is 98260468252.

The square root of 25286406289 is 159017.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 16451910225 + 8834496064 = 128265^2 + 93992^2 .

It is not a de Polignac number, because 25286406289 - 2³ = 25286406281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25286406281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79509 + ... + 238525.

Almost surely, 2^25286406289 is an apocalyptic number.

25286406289 is the 159017-th square number.

25286406289 is the 79509-th centered octagonal number.

It is an amenable number.

25286406289 is a deficient number, since it is larger than the sum of its proper divisors (159018).

25286406289 is an frugal number, since it uses more digits than its factorization.

25286406289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318034 (or 159017 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 25286406289 in words is "twenty-five billion, two hundred eighty-six million, four hundred six thousand, two hundred eighty-nine".