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1289381 is a prime number
BaseRepresentation
bin100111010110010100101
32102111200212
410322302211
5312230011
643345205
713650062
oct4726245
92374625
101289381
11800805
12522205
13361b62
14257c69
151a708b
hex13aca5

1289381 has 2 divisors, whose sum is σ = 1289382. Its totient is φ = 1289380.

The previous prime is 1289371. The next prime is 1289401. The reversal of 1289381 is 1839821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 1156 = 1135^2 + 34^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1289381 is a prime.

It is a super-2 number, since 2×12893812 = 3325006726322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644690 + 644691.

It is an arithmetic number, because the mean of its divisors is an integer number (644691).

21289381 is an apocalyptic number.

It is an amenable number.

1289381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289381 is an equidigital number, since it uses as much as digits as its factorization.

1289381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 1289381 is about 1135.5091369073. The cubic root of 1289381 is about 108.8413087896.

The spelling of 1289381 in words is "one million, two hundred eighty-nine thousand, three hundred eighty-one".