1213456547 has 2 divisors, whose sum is σ = 1213456548. Its totient is φ = 1213456546.

The previous prime is 1213456523. The next prime is 1213456553. The reversal of 1213456547 is 7456543121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213456547 - 2²⁴ = 1196679331 is a prime.

It is a super-4 number, since 4×1213456547⁴ (a number of 37 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213456547.

It is not a weakly prime, because it can be changed into another prime (1213456567) 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 as a sum of consecutive naturals, namely, 606728273 + 606728274.

It is an arithmetic number, because the mean of its divisors is an integer number (606728274).

Almost surely, 2^1213456547 is an apocalyptic number.

1213456547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213456547 is an equidigital number, since it uses as much as digits as its factorization.

1213456547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 1213456547 is about 34834.7031995394. The cubic root of 1213456547 is about 1066.6159564543.

Adding to 1213456547 its reverse (7456543121), we get a palindrome (8669999668).

The spelling of 1213456547 in words is "one billion, two hundred thirteen million, four hundred fifty-six thousand, five hundred forty-seven".