1258717855 has 4 divisors (see below), whose sum is σ = 1510461432. Its totient is φ = 1006974280.

The previous prime is 1258717841. The next prime is 1258717877. The reversal of 1258717855 is 5587178521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5587178521 = 1451 ⋅3850571.

It is not a de Polignac number, because 1258717855 - 2⁷ = 1258717727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1258717799 and 1258717808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125871781 + ... + 125871790.

It is an arithmetic number, because the mean of its divisors is an integer number (377615358).

Almost surely, 2^1258717855 is an apocalyptic number.

1258717855 is a deficient number, since it is larger than the sum of its proper divisors (251743577).

1258717855 is an equidigital number, since it uses as much as digits as its factorization.

1258717855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251743576.

The product of its digits is 784000, while the sum is 49.

The square root of 1258717855 is about 35478.4139301632. The cubic root of 1258717855 is about 1079.7158188626.

The spelling of 1258717855 in words is "one billion, two hundred fifty-eight million, seven hundred seventeen thousand, eight hundred fifty-five".