1211364047 has 4 divisors (see below), whose sum is σ = 1231222536. Its totient is φ = 1191505560.

The previous prime is 1211364043. The next prime is 1211364067. The reversal of 1211364047 is 7404631121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7404631121 = 47 ⋅157545343.

It is a cyclic number.

It is not a de Polignac number, because 1211364047 - 2² = 1211364043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211364043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9929153 + ... + 9929274.

It is an arithmetic number, because the mean of its divisors is an integer number (307805634).

Almost surely, 2^1211364047 is an apocalyptic number.

1211364047 is a deficient number, since it is larger than the sum of its proper divisors (19858489).

1211364047 is an equidigital number, since it uses as much as digits as its factorization.

1211364047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19858488.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1211364047 is about 34804.6555362928. The cubic root of 1211364047 is about 1066.0025083043.

Adding to 1211364047 its reverse (7404631121), we get a palindrome (8615995168).

The spelling of 1211364047 in words is "one billion, two hundred eleven million, three hundred sixty-four thousand, forty-seven".