25521143 has 4 divisors (see below), whose sum is σ = 26002728. Its totient is φ = 25039560.

The previous prime is 25521127. The next prime is 25521149. The reversal of 25521143 is 34112552.

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 25521143 - 2⁴ = 25521127 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 (25521149) 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, 240713 + ... + 240818.

It is an arithmetic number, because the mean of its divisors is an integer number (6500682).

Almost surely, 2^25521143 is an apocalyptic number.

25521143 is a deficient number, since it is larger than the sum of its proper divisors (481585).

25521143 is an equidigital number, since it uses as much as digits as its factorization.

25521143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481584.

The product of its digits is 1200, while the sum is 23.

The square root of 25521143 is about 5051.8455043677. The cubic root of 25521143 is about 294.4195923120.

Adding to 25521143 its reverse (34112552), we get a palindrome (59633695).

The spelling of 25521143 in words is "twenty-five million, five hundred twenty-one thousand, one hundred forty-three".