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76825981 is a prime number
BaseRepresentation
bin1001001010001…
…00010101111101
312100120011102201
410211010111331
5124131412411
611342351501
71622003311
oct445042575
9170504381
1076825981
113a403551
122188b591
1312bbb77b
14a2bbb41
156b283c1
hex494457d

76825981 has 2 divisors, whose sum is σ = 76825982. Its totient is φ = 76825980.

The previous prime is 76825979. The next prime is 76825997. The reversal of 76825981 is 18952867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 13623481 = 7950^2 + 3691^2 .

It is a cyclic number.

It is not a de Polignac number, because 76825981 - 21 = 76825979 is a prime.

It is a super-2 number, since 2×768259812 = 11804462713224722, which contains 22 as substring.

Together with 76825979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76825921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38412990 + 38412991.

It is an arithmetic number, because the mean of its divisors is an integer number (38412991).

Almost surely, 276825981 is an apocalyptic number.

76825981 is the 5544-th centered pentagonal number and also the 5061-st hex number.

It is an amenable number.

76825981 is a deficient number, since it is larger than the sum of its proper divisors (1).

76825981 is an equidigital number, since it uses as much as digits as its factorization.

76825981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 76825981 is about 8765.0431259635. The cubic root of 76825981 is about 425.1113544431. Note that the first 3 decimals are identical.

The spelling of 76825981 in words is "seventy-six million, eight hundred twenty-five thousand, nine hundred eighty-one".