1212345505 has 16 divisors (see below), whose sum is σ = 1696579200. Its totient is φ = 831321456.

The previous prime is 1212345481. The next prime is 1212345509. The reversal of 1212345505 is 5055432121.

It is not a de Polignac number, because 1212345505 - 2¹⁵ = 1212312737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212345509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351739 + ... + 355168.

It is an arithmetic number, because the mean of its divisors is an integer number (106036200).

Almost surely, 2^1212345505 is an apocalyptic number.

It is an amenable number.

1212345505 is a deficient number, since it is larger than the sum of its proper divisors (484233695).

1212345505 is an frugal number, since it uses more digits than its factorization.

1212345505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706933 (or 706919 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1212345505 is about 34818.7522033745. The cubic root of 1212345505 is about 1066.2903255141.

Adding to 1212345505 its reverse (5055432121), we get a palindrome (6267777626).

The spelling of 1212345505 in words is "one billion, two hundred twelve million, three hundred forty-five thousand, five hundred five".