1212345745 has 8 divisors (see below), whose sum is σ = 1566723816. Its totient is φ = 895270656.

The previous prime is 1212345733. The next prime is 1212345751. The reversal of 1212345745 is 5475432121.

It can be written as a sum of positive squares in 4 ways, for example, as 15116544 + 1197229201 = 3888^2 + 34601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212345745 - 2⁵ = 1212345713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212345745.

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, 9325672 + ... + 9325801.

It is an arithmetic number, because the mean of its divisors is an integer number (195840477).

Almost surely, 2^1212345745 is an apocalyptic number.

It is an amenable number.

1212345745 is a deficient number, since it is larger than the sum of its proper divisors (354378071).

1212345745 is a wasteful number, since it uses less digits than its factorization.

1212345745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18651491.

The product of its digits is 33600, while the sum is 34.

The square root of 1212345745 is about 34818.7556497931. The cubic root of 1212345745 is about 1066.2903958762.

Adding to 1212345745 its reverse (5475432121), we get a palindrome (6687777866).

The spelling of 1212345745 in words is "one billion, two hundred twelve million, three hundred forty-five thousand, seven hundred forty-five".