25355921 has 2 divisors, whose sum is σ = 25355922. Its totient is φ = 25355920.

The previous prime is 25355903. The next prime is 25355933. The reversal of 25355921 is 12955352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 1784896 = 4855^2 + 1336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25355921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25355021) 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, 12677960 + 12677961.

It is an arithmetic number, because the mean of its divisors is an integer number (12677961).

Almost surely, 2^25355921 is an apocalyptic number.

It is an amenable number.

25355921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25355921 is an equidigital number, since it uses as much as digits as its factorization.

25355921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 32.

The square root of 25355921 is about 5035.4663140567. The cubic root of 25355921 is about 293.7828660375.

The spelling of 25355921 in words is "twenty-five million, three hundred fifty-five thousand, nine hundred twenty-one".