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1222000261 is a prime number
BaseRepresentation
bin100100011010110…
…0011111010000101
310011011102001012221
41020311203322011
510000313002021
6321131412341
742165554656
oct11065437205
93134361187
101222000261
11577872979
122a12b40b1
131662281a1
14b841952d
1572434241
hex48d63e85

1222000261 has 2 divisors, whose sum is σ = 1222000262. Its totient is φ = 1222000260.

The previous prime is 1222000229. The next prime is 1222000303. The reversal of 1222000261 is 1620002221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036196100 + 185804161 = 32190^2 + 13631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222000261 - 25 = 1222000229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222000201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611000130 + 611000131.

It is an arithmetic number, because the mean of its divisors is an integer number (611000131).

Almost surely, 21222000261 is an apocalyptic number.

It is an amenable number.

1222000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222000261 is an equidigital number, since it uses as much as digits as its factorization.

1222000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1222000261 is about 34957.1203190423. The cubic root of 1222000261 is about 1069.1133835129.

Adding to 1222000261 its reverse (1620002221), we get a palindrome (2842002482).

The spelling of 1222000261 in words is "one billion, two hundred twenty-two million, two hundred sixty-one", and thus it is an aban number.