1258420049 has 4 divisors (see below), whose sum is σ = 1258890036. Its totient is φ = 1257950064.

The previous prime is 1258420001. The next prime is 1258420067. The reversal of 1258420049 is 9400248521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 451860049 + 806560000 = 21257^2 + 28400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1258420049 - 2⁸ = 1258419793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1258420099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230954 + ... + 236339.

It is an arithmetic number, because the mean of its divisors is an integer number (314722509).

Almost surely, 2^1258420049 is an apocalyptic number.

It is an amenable number.

1258420049 is a deficient number, since it is larger than the sum of its proper divisors (469987).

1258420049 is an equidigital number, since it uses as much as digits as its factorization.

1258420049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469986.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1258420049 is about 35474.2166791601. The cubic root of 1258420049 is about 1079.6306604585.

The spelling of 1258420049 in words is "one billion, two hundred fifty-eight million, four hundred twenty thousand, forty-nine".