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1209985321 is a prime number
BaseRepresentation
bin100100000011110…
…1110100100101001
310010022210121211011
41020013232210221
54434224012241
6320022103521
741661463666
oct11007564451
93108717734
101209985321
11571006976
1229927aba1
131638ac45c
14b69aca6d
157135e281
hex481ee929

1209985321 has 2 divisors, whose sum is σ = 1209985322. Its totient is φ = 1209985320.

The previous prime is 1209985313. The next prime is 1209985327. The reversal of 1209985321 is 1235899021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 896164096 + 313821225 = 29936^2 + 17715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209985321 - 23 = 1209985313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209985327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604992660 + 604992661.

It is an arithmetic number, because the mean of its divisors is an integer number (604992661).

Almost surely, 21209985321 is an apocalyptic number.

It is an amenable number.

1209985321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209985321 is an equidigital number, since it uses as much as digits as its factorization.

1209985321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1209985321 is about 34784.8432654224. The cubic root of 1209985321 is about 1065.5979276651.

The spelling of 1209985321 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, three hundred twenty-one".