1151163481 has 4 divisors (see below), whose sum is σ = 1239714532. Its totient is φ = 1062612432.

The previous prime is 1151163479. The next prime is 1151163487. The reversal of 1151163481 is 1843611511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414529600 + 736633881 = 20360^2 + 27141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151163481 - 2¹ = 1151163479 is a prime.

It is a super-2 number, since 2×1151163481² = 2650354719976074722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151163487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44275506 + ... + 44275531.

It is an arithmetic number, because the mean of its divisors is an integer number (309928633).

Almost surely, 2^1151163481 is an apocalyptic number.

It is an amenable number.

1151163481 is a deficient number, since it is larger than the sum of its proper divisors (88551051).

1151163481 is an equidigital number, since it uses as much as digits as its factorization.

1151163481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88551050.

The product of its digits is 2880, while the sum is 31.

The square root of 1151163481 is about 33928.8001703567. The cubic root of 1151163481 is about 1048.0427578193.

Adding to 1151163481 its reverse (1843611511), we get a palindrome (2994774992).

The spelling of 1151163481 in words is "one billion, one hundred fifty-one million, one hundred sixty-three thousand, four hundred eighty-one".