1151121440 has 48 divisors (see below), whose sum is σ = 3108030912. Its totient is φ = 394669824.

The previous prime is 1151121383. The next prime is 1151121443. The reversal of 1151121440 is 441211511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1151121443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512774 + ... + 515013.

It is an arithmetic number, because the mean of its divisors is an integer number (64750644).

Almost surely, 2^1151121440 is an apocalyptic number.

1151121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1151121440 is an abundant number, since it is smaller than the sum of its proper divisors (1956909472).

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

1151121440 is a wasteful number, since it uses less digits than its factorization.

1151121440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027809 (or 1027801 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 1151121440 is about 33928.1806172981. The cubic root of 1151121440 is about 1048.0299993355.

Adding to 1151121440 its reverse (441211511), we get a palindrome (1592332951).

The spelling of 1151121440 in words is "one billion, one hundred fifty-one million, one hundred twenty-one thousand, four hundred forty".