1247055123 has 4 divisors (see below), whose sum is σ = 1662740168. Its totient is φ = 831370080.

The previous prime is 1247055119. The next prime is 1247055127. The reversal of 1247055123 is 3215507421.

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

It is an interprime number because it is at equal distance from previous prime (1247055119) and next prime (1247055127).

It is not a de Polignac number, because 1247055123 - 2² = 1247055119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247055127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207842518 + ... + 207842523.

It is an arithmetic number, because the mean of its divisors is an integer number (415685042).

Almost surely, 2^1247055123 is an apocalyptic number.

1247055123 is a deficient number, since it is larger than the sum of its proper divisors (415685045).

1247055123 is an equidigital number, since it uses as much as digits as its factorization.

1247055123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415685044.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1247055123 is about 35313.6676514915. The cubic root of 1247055123 is about 1076.3707404729.

The spelling of 1247055123 in words is "one billion, two hundred forty-seven million, fifty-five thousand, one hundred twenty-three".