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51394561 = 6721072
BaseRepresentation
bin1100010000001…
…1100000000001
310120201010002021
43010003200001
5101124111221
65033321441
71162563241
oct304034001
9116633067
1051394561
1127013549
1215266281
13a8560aa
146b7bb21
1547a3041
hex3103801

51394561 has 9 divisors (see below), whose sum is σ = 52665249. Its totient is φ = 50154324.

The previous prime is 51394543. The next prime is 51394579. The reversal of 51394561 is 16549315.

The square root of 51394561 is 7169.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (51394543) and next prime (51394579).

It is not a de Polignac number, because 51394561 - 25 = 51394529 is a prime.

It is a super-3 number, since 3×513945613 (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51394501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 480270 + ... + 480376.

Almost surely, 251394561 is an apocalyptic number.

51394561 is the 7169-th square number.

51394561 is the 3585-th centered octagonal number.

It is an amenable number.

51394561 is a deficient number, since it is larger than the sum of its proper divisors (1270688).

51394561 is an frugal number, since it uses more digits than its factorization.

51394561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 174 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The cubic root of 51394561 is about 371.7968622497.

The spelling of 51394561 in words is "fifty-one million, three hundred ninety-four thousand, five hundred sixty-one".

Divisors: 1 67 107 4489 7169 11449 480323 767083 51394561