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BaseRepresentation
bin1100001010001…
…1001011000000
310112222001211220
43002203023000
5101024000000
65021035040
71156331022
oct302431300
9115861756
1051000000
1126874067
12150b5a80
13a74861c
146ab8012
1547261a0
hex30a32c0

51000000 has 196 divisors, whose sum is σ = 178591464. Its totient is φ = 12800000.

The previous prime is 50999999. The next prime is 51000041. The reversal of 51000000 is 15.

Adding to 51000000 its reverse (15), we get a palindrome (51000015).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2999992 + ... + 3000008.

Almost surely, 251000000 is an apocalyptic number.

51000000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89295732).

51000000 is an abundant number, since it is smaller than the sum of its proper divisors (127591464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51000000 is an frugal number, since it uses more digits than its factorization.

51000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 6.

The square root of 51000000 is about 7141.4284285428. The cubic root of 51000000 is about 370.8429769266.

The spelling of 51000000 in words is "fifty-one million", and thus it is an aban number and an uban number.