1221109457 has 2 divisors, whose sum is σ = 1221109458. Its totient is φ = 1221109456.

The previous prime is 1221109433. The next prime is 1221109523. The reversal of 1221109457 is 7549011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 854042176 + 367067281 = 29224^2 + 19159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221109457 - 2²² = 1216915153 is a prime.

It is a super-2 number, since 2×1221109457² = 2982216611949669698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221109427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610554728 + 610554729.

It is an arithmetic number, because the mean of its divisors is an integer number (610554729).

Almost surely, 2^1221109457 is an apocalyptic number.

It is an amenable number.

1221109457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221109457 is an equidigital number, since it uses as much as digits as its factorization.

1221109457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1221109457 is about 34944.3766148432. The cubic root of 1221109457 is about 1068.8535357808.

The spelling of 1221109457 in words is "one billion, two hundred twenty-one million, one hundred nine thousand, four hundred fifty-seven".