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189637109 is a prime number
BaseRepresentation
bin10110100110110…
…10000111110101
3111012211120012122
423103122013311
5342021341414
630452325325
74461613604
oct1323320765
9435746178
10189637109
1198055192
1253613845
133039950c
141b285a3b
15119adb8e
hexb4da1f5

189637109 has 2 divisors, whose sum is σ = 189637110. Its totient is φ = 189637108.

The previous prime is 189637103. The next prime is 189637121. The reversal of 189637109 is 901736981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181656484 + 7980625 = 13478^2 + 2825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-189637109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189637109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189637103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94818554 + 94818555.

It is an arithmetic number, because the mean of its divisors is an integer number (94818555).

Almost surely, 2189637109 is an apocalyptic number.

It is an amenable number.

189637109 is a deficient number, since it is larger than the sum of its proper divisors (1).

189637109 is an equidigital number, since it uses as much as digits as its factorization.

189637109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 189637109 is about 13770.8790206000. The cubic root of 189637109 is about 574.5234705933.

The spelling of 189637109 in words is "one hundred eighty-nine million, six hundred thirty-seven thousand, one hundred nine".