1081278591 has 16 divisors (see below), whose sum is σ = 1527176448. Its totient is φ = 678153600.

The previous prime is 1081278563. The next prime is 1081278607. The reversal of 1081278591 is 1958721801.

It is not a de Polignac number, because 1081278591 - 2¹⁰ = 1081277567 is a prime.

It is a super-3 number, since 3×1081278591³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081278091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213276 + ... + 218286.

It is an arithmetic number, because the mean of its divisors is an integer number (95448528).

Almost surely, 2^1081278591 is an apocalyptic number.

1081278591 is a deficient number, since it is larger than the sum of its proper divisors (445897857).

1081278591 is a wasteful number, since it uses less digits than its factorization.

1081278591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262.

The product of its (nonzero) digits is 40320, while the sum is 42.

The square root of 1081278591 is about 32882.8008387363. The cubic root of 1081278591 is about 1026.3902897887.

The spelling of 1081278591 in words is "one billion, eighty-one million, two hundred seventy-eight thousand, five hundred ninety-one".