1222515145 has 4 divisors (see below), whose sum is σ = 1467018180. Its totient is φ = 978012112.

The previous prime is 1222515143. The next prime is 1222515149. The reversal of 1222515145 is 5415152221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 939299904 + 283215241 = 30648^2 + 16829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222515145 - 2¹ = 1222515143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222515143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122251510 + ... + 122251519.

It is an arithmetic number, because the mean of its divisors is an integer number (366754545).

Almost surely, 2^1222515145 is an apocalyptic number.

It is an amenable number.

1222515145 is a deficient number, since it is larger than the sum of its proper divisors (244503035).

1222515145 is an equidigital number, since it uses as much as digits as its factorization.

1222515145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244503034.

The product of its digits is 4000, while the sum is 28.

The square root of 1222515145 is about 34964.4840516774. The cubic root of 1222515145 is about 1069.2635177092.

Adding to 1222515145 its reverse (5415152221), we get a palindrome (6637667366).

The spelling of 1222515145 in words is "one billion, two hundred twenty-two million, five hundred fifteen thousand, one hundred forty-five".