25903921 has 2 divisors, whose sum is σ = 25903922. Its totient is φ = 25903920.

The previous prime is 25903919. The next prime is 25903963. The reversal of 25903921 is 12930952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 11189025 = 3836^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 25903921 - 2¹ = 25903919 is a prime.

Together with 25903919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25903981) 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, 12951960 + 12951961.

It is an arithmetic number, because the mean of its divisors is an integer number (12951961).

Almost surely, 2^25903921 is an apocalyptic number.

25903921 is the 2721-st centered heptagonal number.

It is an amenable number.

25903921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25903921 is an equidigital number, since it uses as much as digits as its factorization.

25903921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 25903921 is about 5089.5894726392. The cubic root of 25903921 is about 295.8842414716.

The spelling of 25903921 in words is "twenty-five million, nine hundred three thousand, nine hundred twenty-one".