1212051505 has 24 divisors (see below), whose sum is σ = 1704144960. Its totient is φ = 825118560.

The previous prime is 1212051487. The next prime is 1212051509. The reversal of 1212051505 is 5051502121.

It is a happy number.

It is not a de Polignac number, because 1212051505 - 2²⁷ = 1077833777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212051509) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 16260 + ... + 51850.

It is an arithmetic number, because the mean of its divisors is an integer number (71006040).

Almost surely, 2^1212051505 is an apocalyptic number.

It is an amenable number.

1212051505 is a deficient number, since it is larger than the sum of its proper divisors (492093455).

1212051505 is a wasteful number, since it uses less digits than its factorization.

1212051505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35749 (or 35742 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1212051505 is about 34814.5300844346. The cubic root of 1212051505 is about 1066.2041249223.

Adding to 1212051505 its reverse (5051502121), we get a palindrome (6263553626).

The spelling of 1212051505 in words is "one billion, two hundred twelve million, fifty-one thousand, five hundred five".