25501321 has 4 divisors (see below), whose sum is σ = 25982532. Its totient is φ = 25020112.

The previous prime is 25501277. The next prime is 25501337. The reversal of 25501321 is 12310552.

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 9985600 + 15515721 = 3160^2 + 3939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25501321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25501351) 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, 240526 + ... + 240631.

It is an arithmetic number, because the mean of its divisors is an integer number (6495633).

Almost surely, 2^25501321 is an apocalyptic number.

It is an amenable number.

25501321 is a deficient number, since it is larger than the sum of its proper divisors (481211).

25501321 is an equidigital number, since it uses as much as digits as its factorization.

25501321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481210.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 25501321 is about 5049.8832659775. The cubic root of 25501321 is about 294.3433483819.

Adding to 25501321 its reverse (12310552), we get a palindrome (37811873).

The spelling of 25501321 in words is "twenty-five million, five hundred one thousand, three hundred twenty-one".