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1289213 is a prime number
BaseRepresentation
bin100111010101111111101
32102111110122
410322233331
5312223323
643344325
713646432
oct4725775
92374418
101289213
11800672
125220a5
13361a63
14257b89
151a6ec8
hex13abfd

1289213 has 2 divisors, whose sum is σ = 1289214. Its totient is φ = 1289212.

The previous prime is 1289179. The next prime is 1289231. The reversal of 1289213 is 3129821.

Together with next prime (1289231) 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., 683929 + 605284 = 827^2 + 778^2 .

It is an emirp because it is prime and its reverse (3129821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1289213 - 26 = 1289149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644606 + 644607.

It is an arithmetic number, because the mean of its divisors is an integer number (644607).

21289213 is an apocalyptic number.

It is an amenable number.

1289213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289213 is an equidigital number, since it uses as much as digits as its factorization.

1289213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1289213 is about 1135.4351588708. The cubic root of 1289213 is about 108.8365814220.

The spelling of 1289213 in words is "one million, two hundred eighty-nine thousand, two hundred thirteen".