25721461 has 2 divisors, whose sum is σ = 25721462. Its totient is φ = 25721460.

The previous prime is 25721447. The next prime is 25721503. The reversal of 25721461 is 16412752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 2739025 = 4794^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 25721461 - 2¹¹ = 25719413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25721431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860730 + 12860731.

It is an arithmetic number, because the mean of its divisors is an integer number (12860731).

Almost surely, 2^25721461 is an apocalyptic number.

It is an amenable number.

25721461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25721461 is an equidigital number, since it uses as much as digits as its factorization.

25721461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 25721461 is about 5071.6329717360. The cubic root of 25721461 is about 295.1878952362.

The spelling of 25721461 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred sixty-one".