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57391393 is a prime number
BaseRepresentation
bin1101101011101…
…1100100100001
310222222210012011
43122323210201
5104143011033
65410032521
71264550563
oct332734441
9128883164
1057391393
112a43a004
1217278741
13bb75807
14789d333
155089ccd
hex36bb921

57391393 has 2 divisors, whose sum is σ = 57391394. Its totient is φ = 57391392.

The previous prime is 57391391. The next prime is 57391459. The reversal of 57391393 is 39319375.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31002624 + 26388769 = 5568^2 + 5137^2 .

It is a cyclic number.

It is not a de Polignac number, because 57391393 - 21 = 57391391 is a prime.

Together with 57391391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (57391391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28695696 + 28695697.

It is an arithmetic number, because the mean of its divisors is an integer number (28695697).

Almost surely, 257391393 is an apocalyptic number.

It is an amenable number.

57391393 is a deficient number, since it is larger than the sum of its proper divisors (1).

57391393 is an equidigital number, since it uses as much as digits as its factorization.

57391393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 40.

The square root of 57391393 is about 7575.7107257339. The cubic root of 57391393 is about 385.7289680151.

The spelling of 57391393 in words is "fifty-seven million, three hundred ninety-one thousand, three hundred ninety-three".