25424621 has 2 divisors, whose sum is σ = 25424622. Its totient is φ = 25424620.

The previous prime is 25424593. The next prime is 25424647. The reversal of 25424621 is 12642452.

It is an a-pointer prime, because the next prime (25424647) can be obtained adding 25424621 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 8491396 = 4115^2 + 2914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25424621 is a prime.

It is a super-2 number, since 2×25424621² = 1292822705987282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25424521) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712310 + 12712311.

It is an arithmetic number, because the mean of its divisors is an integer number (12712311).

Almost surely, 2^25424621 is an apocalyptic number.

It is an amenable number.

25424621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424621 is an equidigital number, since it uses as much as digits as its factorization.

25424621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

The square root of 25424621 is about 5042.2833121514. The cubic root of 25424621 is about 294.0479544465.

The spelling of 25424621 in words is "twenty-five million, four hundred twenty-four thousand, six hundred twenty-one".