1213534345511 has 4 divisors (see below), whose sum is σ = 1243132744224. Its totient is φ = 1183935946800.

The previous prime is 1213534345501. The next prime is 1213534345519. The reversal of 1213534345511 is 1155434353121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213534345511 - 2²⁶ = 1213467236647 is a prime.

It is a super-2 number, since 2×1213534345511² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213534345519) 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, 14799199295 + ... + 14799199376.

It is an arithmetic number, because the mean of its divisors is an integer number (310783186056).

Almost surely, 2^{1213534345511} is an apocalyptic number.

1213534345511 is a deficient number, since it is larger than the sum of its proper divisors (29598398713).

1213534345511 is an equidigital number, since it uses as much as digits as its factorization.

1213534345511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29598398712.

The product of its digits is 108000, while the sum is 38.

Adding to 1213534345511 its reverse (1155434353121), we get a palindrome (2368968698632).

The spelling of 1213534345511 in words is "one trillion, two hundred thirteen billion, five hundred thirty-four million, three hundred forty-five thousand, five hundred eleven".