1223142505 has 8 divisors (see below), whose sum is σ = 1580676552. Its totient is φ = 903243648.

The previous prime is 1223142493. The next prime is 1223142539. The reversal of 1223142505 is 5052413221.

It can be written as a sum of positive squares in 4 ways, for example, as 18774889 + 1204367616 = 4333^2 + 34704^2 .

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 1223142505 - 2⁷ = 1223142377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1223142505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9408724 + ... + 9408853.

It is an arithmetic number, because the mean of its divisors is an integer number (197584569).

Almost surely, 2^1223142505 is an apocalyptic number.

It is an amenable number.

1223142505 is a deficient number, since it is larger than the sum of its proper divisors (357534047).

1223142505 is a wasteful number, since it uses less digits than its factorization.

1223142505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18817595.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1223142505 is about 34973.4542903614. The cubic root of 1223142505 is about 1069.4463916388.

Adding to 1223142505 its reverse (5052413221), we get a palindrome (6275555726).

The spelling of 1223142505 in words is "one billion, two hundred twenty-three million, one hundred forty-two thousand, five hundred five".