25467721 has 2 divisors, whose sum is σ = 25467722. Its totient is φ = 25467720.

The previous prime is 25467703. The next prime is 25467727. The reversal of 25467721 is 12776452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 577600 = 4989^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 25467721 - 2⁷ = 25467593 is a prime.

It is not a weakly prime, because it can be changed into another prime (25467727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12733860 + 12733861.

It is an arithmetic number, because the mean of its divisors is an integer number (12733861).

Almost surely, 2^25467721 is an apocalyptic number.

It is an amenable number.

25467721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25467721 is an equidigital number, since it uses as much as digits as its factorization.

25467721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 34.

The square root of 25467721 is about 5046.5553598470. Note that the first 3 decimals coincide. The cubic root of 25467721 is about 294.2140180454.

The spelling of 25467721 in words is "twenty-five million, four hundred sixty-seven thousand, seven hundred twenty-one".