1215643255 has 8 divisors (see below), whose sum is σ = 1459151424. Its totient is φ = 972261600.

The previous prime is 1215643223. The next prime is 1215643291. The reversal of 1215643255 is 5523465121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1215643255 - 2⁵ = 1215643223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215643255.

It is a congruent number.

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, 9016 + ... + 50125.

It is an arithmetic number, because the mean of its divisors is an integer number (182393928).

Almost surely, 2^1215643255 is an apocalyptic number.

1215643255 is a deficient number, since it is larger than the sum of its proper divisors (243508169).

1215643255 is an equidigital number, since it uses as much as digits as its factorization.

1215643255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63257.

The product of its digits is 36000, while the sum is 34.

The square root of 1215643255 is about 34866.0759908539. The cubic root of 1215643255 is about 1067.2562700092.

The spelling of 1215643255 in words is "one billion, two hundred fifteen million, six hundred forty-three thousand, two hundred fifty-five".