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72000109 is a prime number
BaseRepresentation
bin1000100101010…
…10001001101101
312000110222120201
410102222021231
5121413000414
611051113501
71532663566
oct422521155
9160428521
1072000109
1137707825
1220142891
1311bbc01c
1497c316d
1564c3574
hex44aa26d

72000109 has 2 divisors, whose sum is σ = 72000110. Its totient is φ = 72000108.

The previous prime is 72000091. The next prime is 72000121. The reversal of 72000109 is 90100027.

Together with previous prime (72000091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45765225 + 26234884 = 6765^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 72000109 - 29 = 71999597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72000169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36000054 + 36000055.

It is an arithmetic number, because the mean of its divisors is an integer number (36000055).

Almost surely, 272000109 is an apocalyptic number.

It is an amenable number.

72000109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72000109 is an equidigital number, since it uses as much as digits as its factorization.

72000109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 72000109 is about 8485.2877971227. The cubic root of 72000109 is about 416.0169745447.

The spelling of 72000109 in words is "seventy-two million, one hundred nine", and thus it is an aban number.