1212858055 has 4 divisors (see below), whose sum is σ = 1455429672. Its totient is φ = 970286440.

The previous prime is 1212858029. The next prime is 1212858067. The reversal of 1212858055 is 5508582121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5508582121 = 7 ⋅786940303.

It is not a de Polignac number, because 1212858055 - 2⁷ = 1212857927 is a prime.

It is a Duffinian number.

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, 121285801 + ... + 121285810.

It is an arithmetic number, because the mean of its divisors is an integer number (363857418).

Almost surely, 2^1212858055 is an apocalyptic number.

1212858055 is a deficient number, since it is larger than the sum of its proper divisors (242571617).

1212858055 is an equidigital number, since it uses as much as digits as its factorization.

1212858055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242571616.

The product of its (nonzero) digits is 32000, while the sum is 37.

The square root of 1212858055 is about 34826.1116836204. Note that the first 3 decimals coincide. The cubic root of 1212858055 is about 1066.4405714912.

The spelling of 1212858055 in words is "one billion, two hundred twelve million, eight hundred fifty-eight thousand, fifty-five".