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189601661 is a prime number
BaseRepresentation
bin10110100110100…
…01011101111101
3111012202202120202
423103101131331
5342014223121
630451453245
74461405344
oct1323213575
9435682522
10189601661
1198030597
12535b7225
1330386342
141b276b5b
15119a340b
hexb4d177d

189601661 has 2 divisors, whose sum is σ = 189601662. Its totient is φ = 189601660.

The previous prime is 189601649. The next prime is 189601667. The reversal of 189601661 is 166106981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136165561 + 53436100 = 11669^2 + 7310^2 .

It is an emirp because it is prime and its reverse (166106981) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 199109681 and 186901991.

It is a cyclic number.

It is not a de Polignac number, because 189601661 - 26 = 189601597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189601667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94800830 + 94800831.

It is an arithmetic number, because the mean of its divisors is an integer number (94800831).

Almost surely, 2189601661 is an apocalyptic number.

It is an amenable number.

189601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

189601661 is an equidigital number, since it uses as much as digits as its factorization.

189601661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 189601661 is about 13769.5918966395. The cubic root of 189601661 is about 574.4876706784.

The spelling of 189601661 in words is "one hundred eighty-nine million, six hundred one thousand, six hundred sixty-one".