1151221311 has 12 divisors (see below), whose sum is σ = 1671318792. Its totient is φ = 763583856.

The previous prime is 1151221303. The next prime is 1151221333. The reversal of 1151221311 is 1131221511.

It is not a de Polignac number, because 1151221311 - 2³ = 1151221303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151221361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322881 + ... + 326426.

It is an arithmetic number, because the mean of its divisors is an integer number (139276566).

Almost surely, 2^1151221311 is an apocalyptic number.

1151221311 is a deficient number, since it is larger than the sum of its proper divisors (520097481).

1151221311 is a wasteful number, since it uses less digits than its factorization.

1151221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649510 (or 649507 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 1151221311 is about 33929.6523854872. The cubic root of 1151221311 is about 1048.0603073967.

Adding to 1151221311 its reverse (1131221511), we get a palindrome (2282442822).

It can be divided in two parts, 11512 and 21311, that added together give a palindrome (32823).

The spelling of 1151221311 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, three hundred eleven".