1213311542 has 16 divisors (see below), whose sum is σ = 1883830272. Its totient is φ = 585475560.

The previous prime is 1213311529. The next prime is 1213311551. The reversal of 1213311542 is 2451133121.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3908 + ... + 49415.

It is an arithmetic number, because the mean of its divisors is an integer number (117739392).

Almost surely, 2^1213311542 is an apocalyptic number.

1213311542 is a deficient number, since it is larger than the sum of its proper divisors (670518730).

1213311542 is a wasteful number, since it uses less digits than its factorization.

1213311542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53723.

The product of its digits is 720, while the sum is 23.

The square root of 1213311542 is about 34832.6218077250. The cubic root of 1213311542 is about 1066.5734687887.

Adding to 1213311542 its reverse (2451133121), we get a palindrome (3664444663).

The spelling of 1213311542 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, five hundred forty-two".