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257720621 is a prime number
BaseRepresentation
bin11110101110010…
…00000100101101
3122221221120020012
433113020010231
51011434024441
641323503005
76246406034
oct1727100455
9587846205
10257720621
11122527354
1272387a65
1341516912
142632971b
151795b9eb
hexf5c812d

257720621 has 2 divisors, whose sum is σ = 257720622. Its totient is φ = 257720620.

The previous prime is 257720563. The next prime is 257720627. The reversal of 257720621 is 126027752.

257720621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175165225 + 82555396 = 13235^2 + 9086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-257720621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257720627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128860310 + 128860311.

It is an arithmetic number, because the mean of its divisors is an integer number (128860311).

Almost surely, 2257720621 is an apocalyptic number.

It is an amenable number.

257720621 is a deficient number, since it is larger than the sum of its proper divisors (1).

257720621 is an equidigital number, since it uses as much as digits as its factorization.

257720621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 257720621 is about 16053.6793601965. The cubic root of 257720621 is about 636.3798057431.

The spelling of 257720621 in words is "two hundred fifty-seven million, seven hundred twenty thousand, six hundred twenty-one".