1223321291 has 2 divisors, whose sum is σ = 1223321292. Its totient is φ = 1223321290.

The previous prime is 1223321273. The next prime is 1223321303. The reversal of 1223321291 is 1921233221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1921233221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1223321291 - 2²⁶ = 1156212427 is a prime.

It is a super-3 number, since 3×1223321291³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1223321291.

It is not a weakly prime, because it can be changed into another prime (1223321221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611660645 + 611660646.

It is an arithmetic number, because the mean of its divisors is an integer number (611660646).

Almost surely, 2^1223321291 is an apocalyptic number.

1223321291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223321291 is an equidigital number, since it uses as much as digits as its factorization.

1223321291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 1223321291 is about 34976.0102212931. The cubic root of 1223321291 is about 1069.4984958776.

The spelling of 1223321291 in words is "one billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred ninety-one".