1091139673 has 8 divisors (see below), whose sum is σ = 1197245448. Its totient is φ = 988201344.

The previous prime is 1091139671. The next prime is 1091139691. The reversal of 1091139673 is 3769311901.

It can be written as a sum of positive squares in 4 ways, for example, as 23941449 + 1067198224 = 4893^2 + 32668^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1091139673 - 2¹ = 1091139671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091139671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791140 + ... + 792517.

It is an arithmetic number, because the mean of its divisors is an integer number (149655681).

Almost surely, 2^1091139673 is an apocalyptic number.

1091139673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1091139673 is a deficient number, since it is larger than the sum of its proper divisors (106105775).

1091139673 is a wasteful number, since it uses less digits than its factorization.

1091139673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583723.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1091139673 is about 33032.4033791064. The cubic root of 1091139673 is about 1029.5010223332.

The spelling of 1091139673 in words is "one billion, ninety-one million, one hundred thirty-nine thousand, six hundred seventy-three".