1220312451543 has 16 divisors (see below), whose sum is σ = 1628208642816. Its totient is φ = 812979109440.

The previous prime is 1220312451539. The next prime is 1220312451623. The reversal of 1220312451543 is 3451542130221.

It is not a de Polignac number, because 1220312451543 - 2² = 1220312451539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220312491543) 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 15 ways as a sum of consecutive naturals, for example, 37901830 + ... + 37934012.

It is an arithmetic number, because the mean of its divisors is an integer number (101763040176).

Almost surely, 2^{1220312451543} is an apocalyptic number.

1220312451543 is a deficient number, since it is larger than the sum of its proper divisors (407896191273).

1220312451543 is a wasteful number, since it uses less digits than its factorization.

1220312451543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40534.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 1220312451543 its reverse (3451542130221), we get a palindrome (4671854581764).

The spelling of 1220312451543 in words is "one trillion, two hundred twenty billion, three hundred twelve million, four hundred fifty-one thousand, five hundred forty-three".