1220023515 has 16 divisors (see below), whose sum is σ = 1953024768. Its totient is φ = 650350176.

The previous prime is 1220023499. The next prime is 1220023577. The reversal of 1220023515 is 5153200221.

It is not a de Polignac number, because 1220023515 - 2⁴ = 1220023499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220023491 and 1220023500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11722 + ... + 50768.

It is an arithmetic number, because the mean of its divisors is an integer number (122064048).

Almost surely, 2^1220023515 is an apocalyptic number.

1220023515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220023515 is a deficient number, since it is larger than the sum of its proper divisors (733001253).

1220023515 is a wasteful number, since it uses less digits than its factorization.

1220023515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41138.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1220023515 is about 34928.8350077697. The cubic root of 1220023515 is about 1068.5365952623.

Adding to 1220023515 its reverse (5153200221), we get a palindrome (6373223736).

The spelling of 1220023515 in words is "one billion, two hundred twenty million, twenty-three thousand, five hundred fifteen".