1228213081 has 2 divisors, whose sum is σ = 1228213082. Its totient is φ = 1228213080.

The previous prime is 1228213061. The next prime is 1228213099. The reversal of 1228213081 is 1803128221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042708681 + 185504400 = 32291^2 + 13620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228213081 - 2¹³ = 1228204889 is a prime.

It is a super-2 number, since 2×1228213081² = 3017014744679025122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1228213061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614106540 + 614106541.

It is an arithmetic number, because the mean of its divisors is an integer number (614106541).

Almost surely, 2^1228213081 is an apocalyptic number.

It is an amenable number.

1228213081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228213081 is an equidigital number, since it uses as much as digits as its factorization.

1228213081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1228213081 is about 35045.8710977484. The cubic root of 1228213081 is about 1070.9221621935.

The spelling of 1228213081 in words is "one billion, two hundred twenty-eight million, two hundred thirteen thousand, eighty-one".