1215344105 has 4 divisors (see below), whose sum is σ = 1458412932. Its totient is φ = 972275280.

The previous prime is 1215344083. The next prime is 1215344167. The reversal of 1215344105 is 5014435121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5014435121 = 13267 ⋅377963.

It can be written as a sum of positive squares in 2 ways, for example, as 774008041 + 441336064 = 27821^2 + 21008^2 .

It is not a de Polignac number, because 1215344105 - 2¹⁰ = 1215343081 is a prime.

It is a super-2 number, since 2×1215344105² = 2954122587116502050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121534406 + ... + 121534415.

It is an arithmetic number, because the mean of its divisors is an integer number (364603233).

Almost surely, 2^1215344105 is an apocalyptic number.

It is an amenable number.

1215344105 is a deficient number, since it is larger than the sum of its proper divisors (243068827).

1215344105 is an equidigital number, since it uses as much as digits as its factorization.

1215344105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243068826.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1215344105 is about 34861.7857402629. The cubic root of 1215344105 is about 1067.1687180337.

Adding to 1215344105 its reverse (5014435121), we get a palindrome (6229779226).

The spelling of 1215344105 in words is "one billion, two hundred fifteen million, three hundred forty-four thousand, one hundred five".