25765321 has 4 divisors (see below), whose sum is σ = 25863552. Its totient is φ = 25667092.

The previous prime is 25765301. The next prime is 25765331. The reversal of 25765321 is 12356752.

25765321 = T₄₁₄₃ + T₄₁₄₄ + T₄₁₄₅.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25765321 - 2⁷ = 25765193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25765301) 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, 48721 + ... + 49246.

It is an arithmetic number, because the mean of its divisors is an integer number (6465888).

Almost surely, 2^25765321 is an apocalyptic number.

25765321 is the 4145-th centered triangular number.

It is an amenable number.

25765321 is a deficient number, since it is larger than the sum of its proper divisors (98231).

25765321 is an equidigital number, since it uses as much as digits as its factorization.

25765321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98230.

The product of its digits is 12600, while the sum is 31.

The square root of 25765321 is about 5075.9551810472. The cubic root of 25765321 is about 295.3555838581.

The spelling of 25765321 in words is "twenty-five million, seven hundred sixty-five thousand, three hundred twenty-one".