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1257468557 is a prime number
BaseRepresentation
bin100101011110011…
…0111001010001101
310020122011000120112
41022330313022031
510033402443212
6324435525405
743106210042
oct11274671215
93218130515
101257468557
11595898814
122b1159865
13170696147
14bd00d1c9
15755dd422
hex4af3728d

1257468557 has 2 divisors, whose sum is σ = 1257468558. Its totient is φ = 1257468556.

The previous prime is 1257468551. The next prime is 1257468559. The reversal of 1257468557 is 7558647521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930799081 + 326669476 = 30509^2 + 18074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257468557 - 26 = 1257468493 is a prime.

Together with 1257468559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257468551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628734278 + 628734279.

It is an arithmetic number, because the mean of its divisors is an integer number (628734279).

Almost surely, 21257468557 is an apocalyptic number.

It is an amenable number.

1257468557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257468557 is an equidigital number, since it uses as much as digits as its factorization.

1257468557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352000, while the sum is 50.

The square root of 1257468557 is about 35460.8031070928. The cubic root of 1257468557 is about 1079.3584887646.

The spelling of 1257468557 in words is "one billion, two hundred fifty-seven million, four hundred sixty-eight thousand, five hundred fifty-seven".