1220727149 has 2 divisors, whose sum is σ = 1220727150. Its totient is φ = 1220727148.

The previous prime is 1220727133. The next prime is 1220727161. The reversal of 1220727149 is 9417270221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870663049 + 350064100 = 29507^2 + 18710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220727149 - 2⁴ = 1220727133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220723149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610363574 + 610363575.

It is an arithmetic number, because the mean of its divisors is an integer number (610363575).

Almost surely, 2^1220727149 is an apocalyptic number.

It is an amenable number.

1220727149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220727149 is an equidigital number, since it uses as much as digits as its factorization.

1220727149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1220727149 is about 34938.9059502441. The cubic root of 1220727149 is about 1068.7419776925.

The spelling of 1220727149 in words is "one billion, two hundred twenty million, seven hundred twenty-seven thousand, one hundred forty-nine".