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311221109 is a prime number
BaseRepresentation
bin10010100011001…
…101101101110101
3210200121200002202
4102203031231311
51114133033414
650514314245
710466223113
oct2243155565
9720550082
10311221109
1114a749031
1288288985
134c629404
142d494ab3
151c4c89de
hex128cdb75

311221109 has 2 divisors, whose sum is σ = 311221110. Its totient is φ = 311221108.

The previous prime is 311221103. The next prime is 311221111. The reversal of 311221109 is 901122113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308986084 + 2235025 = 17578^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 311221109 - 24 = 311221093 is a prime.

It is a super-3 number, since 3×3112211093 (a number of 26 digits) contains 333 as substring.

Together with 311221111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311221103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610554 + 155610555.

It is an arithmetic number, because the mean of its divisors is an integer number (155610555).

Almost surely, 2311221109 is an apocalyptic number.

It is an amenable number.

311221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221109 is an equidigital number, since it uses as much as digits as its factorization.

311221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 311221109 is about 17641.4599452540. The cubic root of 311221109 is about 677.6774199812.

The spelling of 311221109 in words is "three hundred eleven million, two hundred twenty-one thousand, one hundred nine".