1151878481 has 6 divisors (see below), whose sum is σ = 1247300550. Its totient is φ = 1063272288.

The previous prime is 1151878471. The next prime is 1151878489. The reversal of 1151878481 is 1848781511.

It can be written as a sum of positive squares in 3 ways, for example, as 19219456 + 1132659025 = 4384^2 + 33655^2 .

It is not a de Polignac number, because 1151878481 - 2¹⁴ = 1151862097 is a prime.

It is a super-2 number, since 2×1151878481² = 2653648069981734722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1151878489) 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 5 ways as a sum of consecutive naturals, for example, 3407756 + ... + 3408093.

It is an arithmetic number, because the mean of its divisors is an integer number (207883425).

Almost surely, 2^1151878481 is an apocalyptic number.

It is an amenable number.

1151878481 is a deficient number, since it is larger than the sum of its proper divisors (95422069).

1151878481 is an equidigital number, since it uses as much as digits as its factorization.

1151878481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6815875 (or 6815862 counting only the distinct ones).

The product of its digits is 71680, while the sum is 44.

The square root of 1151878481 is about 33939.3353058070. The cubic root of 1151878481 is about 1048.2596964484.

The spelling of 1151878481 in words is "one billion, one hundred fifty-one million, eight hundred seventy-eight thousand, four hundred eighty-one".