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478478681 is a prime number
BaseRepresentation
bin11100100001010…
…000000101011001
31020100100020100122
4130201100011121
51434442304211
6115251243025
714600000402
oct3441200531
91210306318
10478478681
112260a812a
121142a9475
137818b3a5
14477929a9
152c0166db
hex1c850159

478478681 has 2 divisors, whose sum is σ = 478478682. Its totient is φ = 478478680.

The previous prime is 478478657. The next prime is 478478687. The reversal of 478478681 is 186874874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336392281 + 142086400 = 18341^2 + 11920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-478478681 is a prime.

It is a super-2 number, since 2×4784786812 = 457883696342999522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (478478687) 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, 239239340 + 239239341.

It is an arithmetic number, because the mean of its divisors is an integer number (239239341).

Almost surely, 2478478681 is an apocalyptic number.

It is an amenable number.

478478681 is a deficient number, since it is larger than the sum of its proper divisors (1).

478478681 is an equidigital number, since it uses as much as digits as its factorization.

478478681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2408448, while the sum is 53.

The square root of 478478681 is about 21874.1555494149. The cubic root of 478478681 is about 782.1454635503.

The spelling of 478478681 in words is "four hundred seventy-eight million, four hundred seventy-eight thousand, six hundred eighty-one".