4512121345 has 8 divisors (see below), whose sum is σ = 5516707176. Its totient is φ = 3541589376.

The previous prime is 4512121343. The next prime is 4512121363. The reversal of 4512121345 is 5431212154.

It can be written as a sum of positive squares in 4 ways, for example, as 1002862224 + 3509259121 = 31668^2 + 59239^2 .

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 4512121345 - 2¹ = 4512121343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4512121343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8513172 + ... + 8513701.

It is an arithmetic number, because the mean of its divisors is an integer number (689588397).

Almost surely, 2^4512121345 is an apocalyptic number.

It is an amenable number.

4512121345 is a deficient number, since it is larger than the sum of its proper divisors (1004585831).

4512121345 is a wasteful number, since it uses less digits than its factorization.

4512121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17026931.

The product of its digits is 4800, while the sum is 28.

The square root of 4512121345 is about 67172.3257376131. The cubic root of 4512121345 is about 1652.4446583942. Note that the first 3 decimals are identical.

Adding to 4512121345 its reverse (5431212154), we get a palindrome (9943333499).

It can be divided in two parts, 45121 and 21345, that added together give a palindrome (66466).

The spelling of 4512121345 in words is "four billion, five hundred twelve million, one hundred twenty-one thousand, three hundred forty-five".