25145521 has 4 divisors (see below), whose sum is σ = 25299952. Its totient is φ = 24991092.

The previous prime is 25145501. The next prime is 25145539. The reversal of 25145521 is 12554152.

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 25145521 - 2⁵ = 25145489 is a prime.

It is a super-2 number, since 2×25145521² = 1264594452722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25145501) 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, 76971 + ... + 77296.

It is an arithmetic number, because the mean of its divisors is an integer number (6324988).

Almost surely, 2^25145521 is an apocalyptic number.

It is an amenable number.

25145521 is a deficient number, since it is larger than the sum of its proper divisors (154431).

25145521 is a wasteful number, since it uses less digits than its factorization.

25145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154430.

The product of its digits is 2000, while the sum is 25.

The square root of 25145521 is about 5014.5309850474. The cubic root of 25145521 is about 292.9680178800.

Adding to 25145521 its reverse (12554152), we get a palindrome (37699673).

The spelling of 25145521 in words is "twenty-five million, one hundred forty-five thousand, five hundred twenty-one".