1145001220 has 36 divisors (see below), whose sum is σ = 2642971212. Its totient is φ = 416363200.

The previous prime is 1145001211. The next prime is 1145001239. The reversal of 1145001220 is 221005411.

It can be written as a sum of positive squares in 2 ways, for example, as 753831936 + 391169284 = 27456^2 + 19778^2 .

It is a super-2 number, since 2×1145001220² = 2622055587602976800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1145001194 and 1145001203.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 234151 + ... + 238990.

It is an arithmetic number, because the mean of its divisors is an integer number (73415867).

Almost surely, 2^1145001220 is an apocalyptic number.

1145001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145001220 is an abundant number, since it is smaller than the sum of its proper divisors (1497969992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1145001220 is a wasteful number, since it uses less digits than its factorization.

1145001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473172 (or 473159 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1145001220 is about 33837.8666585233. The cubic root of 1145001220 is about 1046.1693281828.

Adding to 1145001220 its reverse (221005411), we get a palindrome (1366006631).

The spelling of 1145001220 in words is "one billion, one hundred forty-five million, one thousand, two hundred twenty".