25487521 has 2 divisors, whose sum is σ = 25487522. Its totient is φ = 25487520.

The previous prime is 25487479. The next prime is 25487563. The reversal of 25487521 is 12578452.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25487479) and next prime (25487563).

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 8381025 = 4136^2 + 2895^2 .

It is a cyclic number.

It is not a de Polignac number, because 25487521 - 2⁷ = 25487393 is a prime.

It is a super-2 number, since 2×25487521² = 1299227453450882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25487591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12743760 + 12743761.

It is an arithmetic number, because the mean of its divisors is an integer number (12743761).

Almost surely, 2^25487521 is an apocalyptic number.

It is an amenable number.

25487521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25487521 is an equidigital number, since it uses as much as digits as its factorization.

25487521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 25487521 is about 5048.5167128574. The cubic root of 25487521 is about 294.2902443207.

The spelling of 25487521 in words is "twenty-five million, four hundred eighty-seven thousand, five hundred twenty-one".