25140521 has 4 divisors (see below), whose sum is σ = 28732032. Its totient is φ = 21549012.

The previous prime is 25140517. The next prime is 25140527. The reversal of 25140521 is 12504152.

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 25140521 - 2² = 25140517 is a prime.

It is a super-3 number, since 3×25140521³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25140493 and 25140502.

It is not an unprimeable number, because it can be changed into a prime (25140527) 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, 1795745 + ... + 1795758.

It is an arithmetic number, because the mean of its divisors is an integer number (7183008).

Almost surely, 2^25140521 is an apocalyptic number.

It is an amenable number.

25140521 is a deficient number, since it is larger than the sum of its proper divisors (3591511).

25140521 is an equidigital number, since it uses as much as digits as its factorization.

25140521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591510.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 25140521 is about 5014.0324091493. The cubic root of 25140521 is about 292.9485984217.

Adding to 25140521 its reverse (12504152), we get a palindrome (37644673).

The spelling of 25140521 in words is "twenty-five million, one hundred forty thousand, five hundred twenty-one".