1156221260 has 24 divisors (see below), whose sum is σ = 2506390656. Its totient is φ = 447569280.

The previous prime is 1156221239. The next prime is 1156221299. The reversal of 1156221260 is 621226511.

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 7 ways as a sum of consecutive naturals, for example, 931817 + ... + 933056.

It is an arithmetic number, because the mean of its divisors is an integer number (104432944).

Almost surely, 2^1156221260 is an apocalyptic number.

1156221260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156221260 is an abundant number, since it is smaller than the sum of its proper divisors (1350169396).

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

1156221260 is a wasteful number, since it uses less digits than its factorization.

1156221260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864913 (or 1864911 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1156221260 is about 34003.2536678477. The cubic root of 1156221260 is about 1049.5754171502.

Adding to 1156221260 its reverse (621226511), we get a palindrome (1777447771).

The spelling of 1156221260 in words is "one billion, one hundred fifty-six million, two hundred twenty-one thousand, two hundred sixty".