1220631315 has 16 divisors (see below), whose sum is σ = 2020356000. Its totient is φ = 628554752.

The previous prime is 1220631299. The next prime is 1220631317. The reversal of 1220631315 is 5131360221.

It is a cyclic number.

It is not a de Polignac number, because 1220631315 - 2⁴ = 1220631299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220631317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1402590 + ... + 1403459.

It is an arithmetic number, because the mean of its divisors is an integer number (126272250).

Almost surely, 2^1220631315 is an apocalyptic number.

1220631315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220631315 is a deficient number, since it is larger than the sum of its proper divisors (799724685).

1220631315 is a wasteful number, since it uses less digits than its factorization.

1220631315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806086.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1220631315 is about 34937.5344722549. The cubic root of 1220631315 is about 1068.7140095264.

Adding to 1220631315 its reverse (5131360221), we get a palindrome (6351991536).

The spelling of 1220631315 in words is "one billion, two hundred twenty million, six hundred thirty-one thousand, three hundred fifteen".