1221046049 has 2 divisors, whose sum is σ = 1221046050. Its totient is φ = 1221046048.

The previous prime is 1221046037. The next prime is 1221046111. The reversal of 1221046049 is 9406401221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656128225 + 564917824 = 25615^2 + 23768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221046049 - 2⁴ = 1221046033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221046009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610523024 + 610523025.

It is an arithmetic number, because the mean of its divisors is an integer number (610523025).

Almost surely, 2^1221046049 is an apocalyptic number.

It is an amenable number.

1221046049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221046049 is an equidigital number, since it uses as much as digits as its factorization.

1221046049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1221046049 is about 34943.4693326235. The cubic root of 1221046049 is about 1068.8350348354.

The spelling of 1221046049 in words is "one billion, two hundred twenty-one million, forty-six thousand, forty-nine".