1151305221 has 16 divisors (see below), whose sum is σ = 1676989440. Its totient is φ = 696775920.

The previous prime is 1151305217. The next prime is 1151305231. The reversal of 1151305221 is 1225031511.

It is not a de Polignac number, because 1151305221 - 2² = 1151305217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151305231) 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, 535 + ... + 47988.

It is an arithmetic number, because the mean of its divisors is an integer number (104811840).

Almost surely, 2^1151305221 is an apocalyptic number.

1151305221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1151305221 is a deficient number, since it is larger than the sum of its proper divisors (525684219).

1151305221 is a wasteful number, since it uses less digits than its factorization.

1151305221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49256.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1151305221 is about 33930.8888919816. Note that the first 4 decimals coincide. The cubic root of 1151305221 is about 1048.0857703849.

Adding to 1151305221 its reverse (1225031511), we get a palindrome (2376336732).

The spelling of 1151305221 in words is "one billion, one hundred fifty-one million, three hundred five thousand, two hundred twenty-one".