1055561249 has 2 divisors, whose sum is σ = 1055561250. Its totient is φ = 1055561248.

The previous prime is 1055561077. The next prime is 1055561251. The reversal of 1055561249 is 9421655501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888040000 + 167521249 = 29800^2 + 12943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055561249 is a prime.

It is a super-2 number, since 2×1055561249² = 2228419100780880002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1055561251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1055561849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527780624 + 527780625.

It is an arithmetic number, because the mean of its divisors is an integer number (527780625).

Almost surely, 2^1055561249 is an apocalyptic number.

It is an amenable number.

1055561249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055561249 is an equidigital number, since it uses as much as digits as its factorization.

1055561249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 1055561249 is about 32489.4021028396. The cubic root of 1055561249 is about 1018.1876213382.

The spelling of 1055561249 in words is "one billion, fifty-five million, five hundred sixty-one thousand, two hundred forty-nine".