1131045481 has 4 divisors (see below), whose sum is σ = 1131490372. Its totient is φ = 1130600592.

The previous prime is 1131045467. The next prime is 1131045527. The reversal of 1131045481 is 1845401311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1845401311 = 13 ⋅141953947.

It can be written as a sum of positive squares in 2 ways, for example, as 518928400 + 612117081 = 22780^2 + 24741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131045481 - 2²⁷ = 996827753 is a prime.

It is a super-2 number, since 2×1131045481² = 2558527760181042722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131045431) 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, 218610 + ... + 223723.

It is an arithmetic number, because the mean of its divisors is an integer number (282872593).

Almost surely, 2^1131045481 is an apocalyptic number.

It is an amenable number.

1131045481 is a deficient number, since it is larger than the sum of its proper divisors (444891).

1131045481 is an equidigital number, since it uses as much as digits as its factorization.

1131045481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444890.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1131045481 is about 33631.0196247452. The cubic root of 1131045481 is about 1041.9015632343.

Adding to 1131045481 its reverse (1845401311), we get a palindrome (2976446792).

The spelling of 1131045481 in words is "one billion, one hundred thirty-one million, forty-five thousand, four hundred eighty-one".