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188089661 is a prime number
BaseRepresentation
bin10110011011000…
…00010100111101
3111002220221111202
423031200110331
5341122332121
630355225245
74442510234
oct1315402475
9432827452
10188089661
1197198601
1252ba8225
132cc77076
141ada1b1b
15117a540b
hexb36053d

188089661 has 2 divisors, whose sum is σ = 188089662. Its totient is φ = 188089660.

The previous prime is 188089651. The next prime is 188089687. The reversal of 188089661 is 166980881.

188089661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187854436 + 235225 = 13706^2 + 485^2 .

It is an emirp because it is prime and its reverse (166980881) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 199680881 and 188086991.

It is a cyclic number.

It is not a de Polignac number, because 188089661 - 26 = 188089597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188089651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94044830 + 94044831.

It is an arithmetic number, because the mean of its divisors is an integer number (94044831).

Almost surely, 2188089661 is an apocalyptic number.

It is an amenable number.

188089661 is a deficient number, since it is larger than the sum of its proper divisors (1).

188089661 is an equidigital number, since it uses as much as digits as its factorization.

188089661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 188089661 is about 13714.5784113111. The cubic root of 188089661 is about 572.9564874922.

The spelling of 188089661 in words is "one hundred eighty-eight million, eighty-nine thousand, six hundred sixty-one".