1215105109 has 8 divisors (see below), whose sum is σ = 1254732800. Its totient is φ = 1175504400.

The previous prime is 1215105103. The next prime is 1215105113. The reversal of 1215105109 is 9015015121.

It is a happy number.

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 1215105109 - 2⁷ = 1215104981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215105103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127492 + ... + 136690.

It is an arithmetic number, because the mean of its divisors is an integer number (156841600).

Almost surely, 2^1215105109 is an apocalyptic number.

It is an amenable number.

1215105109 is a deficient number, since it is larger than the sum of its proper divisors (39627691).

1215105109 is an equidigital number, since it uses as much as digits as its factorization.

1215105109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13491.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 1215105109 is about 34858.3578069880. The cubic root of 1215105109 is about 1067.0987609534.

The spelling of 1215105109 in words is "one billion, two hundred fifteen million, one hundred five thousand, one hundred nine".