1213155434 has 32 divisors (see below), whose sum is σ = 2014156800. Its totient is φ = 545711040.

The previous prime is 1213155403. The next prime is 1213155509. The reversal of 1213155434 is 4345513121.

It is a super-2 number, since 2×1213155434² = 2943492214087456712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213155397 and 1213155406.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 58199 + ... + 76245.

It is an arithmetic number, because the mean of its divisors is an integer number (62942400).

Almost surely, 2^1213155434 is an apocalyptic number.

1213155434 is a deficient number, since it is larger than the sum of its proper divisors (801001366).

1213155434 is a wasteful number, since it uses less digits than its factorization.

1213155434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18158.

The product of its digits is 7200, while the sum is 29.

The square root of 1213155434 is about 34830.3809051810. The cubic root of 1213155434 is about 1066.5277240681.

Adding to 1213155434 its reverse (4345513121), we get a palindrome (5558668555).

The spelling of 1213155434 in words is "one billion, two hundred thirteen million, one hundred fifty-five thousand, four hundred thirty-four".