1220345115 has 32 divisors (see below), whose sum is σ = 2182021632. Its totient is φ = 577248000.

The previous prime is 1220345107. The next prime is 1220345141. The reversal of 1220345115 is 5115430221.

It is a happy number.

It is not a de Polignac number, because 1220345115 - 2³ = 1220345107 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83431 + ... + 96960.

It is an arithmetic number, because the mean of its divisors is an integer number (68188176).

Almost surely, 2^1220345115 is an apocalyptic number.

1220345115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220345115 is a deficient number, since it is larger than the sum of its proper divisors (961676517).

1220345115 is a wasteful number, since it uses less digits than its factorization.

1220345115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180451.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1220345115 is about 34933.4383506691. The cubic root of 1220345115 is about 1068.6304762885.

Adding to 1220345115 its reverse (5115430221), we get a palindrome (6335775336).

The spelling of 1220345115 in words is "one billion, two hundred twenty million, three hundred forty-five thousand, one hundred fifteen".