25721503 has 2 divisors, whose sum is σ = 25721504. Its totient is φ = 25721502.

The previous prime is 25721461. The next prime is 25721513. The reversal of 25721503 is 30512752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25721503 - 2¹⁷ = 25590431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25721513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860751 + 12860752.

It is an arithmetic number, because the mean of its divisors is an integer number (12860752).

Almost surely, 2^25721503 is an apocalyptic number.

25721503 is a deficient number, since it is larger than the sum of its proper divisors (1).

25721503 is an equidigital number, since it uses as much as digits as its factorization.

25721503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25721503 is about 5071.6371124125. The cubic root of 25721503 is about 295.1880559046.

The spelling of 25721503 in words is "twenty-five million, seven hundred twenty-one thousand, five hundred three".