1081891567 has 4 divisors (see below), whose sum is σ = 1107051880. Its totient is φ = 1056731256.

The previous prime is 1081891541. The next prime is 1081891571. The reversal of 1081891567 is 7651981801.

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

It is a cyclic number.

It is not a de Polignac number, because 1081891567 - 2⁷ = 1081891439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081891367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12580092 + ... + 12580177.

It is an arithmetic number, because the mean of its divisors is an integer number (276762970).

Almost surely, 2^1081891567 is an apocalyptic number.

1081891567 is a deficient number, since it is larger than the sum of its proper divisors (25160313).

1081891567 is an equidigital number, since it uses as much as digits as its factorization.

1081891567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25160312.

The product of its (nonzero) digits is 120960, while the sum is 46.

The square root of 1081891567 is about 32892.1201353759. The cubic root of 1081891567 is about 1026.5842064377.

The spelling of 1081891567 in words is "one billion, eighty-one million, eight hundred ninety-one thousand, five hundred sixty-seven".