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25521521 is a prime number
BaseRepresentation
bin110000101011…
…0110101110001
31210000121221112
41201112311301
523013142041
62311003105
7426633524
oct141266561
953017845
1025521521
1113451773
128669495
1353976bc
143564bbb
152391deb
hex1856d71

25521521 has 2 divisors, whose sum is σ = 25521522. Its totient is φ = 25521520.

The previous prime is 25521497. The next prime is 25521553. The reversal of 25521521 is 12512552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19044496 + 6477025 = 4364^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-25521521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25526521) 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, 12760760 + 12760761.

It is an arithmetic number, because the mean of its divisors is an integer number (12760761).

Almost surely, 225521521 is an apocalyptic number.

It is an amenable number.

25521521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521521 is an equidigital number, since it uses as much as digits as its factorization.

25521521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000, while the sum is 23.

The square root of 25521521 is about 5051.8829162996. The cubic root of 25521521 is about 294.4210458787.

The spelling of 25521521 in words is "twenty-five million, five hundred twenty-one thousand, five hundred twenty-one".