1247311121 has 12 divisors (see below), whose sum is σ = 1454764032. Its totient is φ = 1066316328.

The previous prime is 1247311099. The next prime is 1247311123. The reversal of 1247311121 is 1211137421.

It is a de Polignac number, because none of the positive numbers 2^k-1247311121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247311123) 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 11 ways as a sum of consecutive naturals, for example, 14465 + ... + 51998.

It is an arithmetic number, because the mean of its divisors is an integer number (121230336).

Almost surely, 2^1247311121 is an apocalyptic number.

It is an amenable number.

1247311121 is a deficient number, since it is larger than the sum of its proper divisors (207452911).

1247311121 is an equidigital number, since it uses as much as digits as its factorization.

1247311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66860 (or 66853 counting only the distinct ones).

The product of its digits is 336, while the sum is 23.

The square root of 1247311121 is about 35317.2920960823. The cubic root of 1247311121 is about 1076.4443886217. Note that the first 3 decimals are identical.

Adding to 1247311121 its reverse (1211137421), we get a palindrome (2458448542).

The spelling of 1247311121 in words is "one billion, two hundred forty-seven million, three hundred eleven thousand, one hundred twenty-one".