1258798049 has 2 divisors, whose sum is σ = 1258798050. Its totient is φ = 1258798048.

The previous prime is 1258798019. The next prime is 1258798063. The reversal of 1258798049 is 9408978521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1257979024 + 819025 = 35468^2 + 905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1258798049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1258798019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629399024 + 629399025.

It is an arithmetic number, because the mean of its divisors is an integer number (629399025).

Almost surely, 2^1258798049 is an apocalyptic number.

It is an amenable number.

1258798049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1258798049 is an equidigital number, since it uses as much as digits as its factorization.

1258798049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The square root of 1258798049 is about 35479.5440923358. The cubic root of 1258798049 is about 1079.7387482510.

The spelling of 1258798049 in words is "one billion, two hundred fifty-eight million, seven hundred ninety-eight thousand, forty-nine".