1205220515 has 8 divisors (see below), whose sum is σ = 1452267168. Its totient is φ = 960174720.

The previous prime is 1205220509. The next prime is 1205220517. The reversal of 1205220515 is 5150225021.

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

It is not a de Polignac number, because 1205220515 - 2⁶ = 1205220451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205220517) 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, 498887 + ... + 501296.

It is an arithmetic number, because the mean of its divisors is an integer number (181533396).

Almost surely, 2^1205220515 is an apocalyptic number.

1205220515 is a deficient number, since it is larger than the sum of its proper divisors (247046653).

1205220515 is a wasteful number, since it uses less digits than its factorization.

1205220515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000429.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1205220515 is about 34716.2860196767. The cubic root of 1205220515 is about 1064.1973468320.

Adding to 1205220515 its reverse (5150225021), we get a palindrome (6355445536).

The spelling of 1205220515 in words is "one billion, two hundred five million, two hundred twenty thousand, five hundred fifteen".