1097173891 has 8 divisors (see below), whose sum is σ = 1197678384. Its totient is φ = 996796320.

The previous prime is 1097173879. The next prime is 1097173921. The reversal of 1097173891 is 1983717901.

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

It is a cyclic number.

It is not a de Polignac number, because 1097173891 - 2⁵ = 1097173859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097173841) 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 7 ways as a sum of consecutive naturals, for example, 13176 + ... + 48661.

It is an arithmetic number, because the mean of its divisors is an integer number (149709798).

Almost surely, 2^1097173891 is an apocalyptic number.

1097173891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1097173891 is a deficient number, since it is larger than the sum of its proper divisors (100504493).

1097173891 is a wasteful number, since it uses less digits than its factorization.

1097173891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63461.

The product of its (nonzero) digits is 95256, while the sum is 46.

The square root of 1097173891 is about 33123.6153069075. The cubic root of 1097173891 is about 1031.3953160340.

The spelling of 1097173891 in words is "one billion, ninety-seven million, one hundred seventy-three thousand, eight hundred ninety-one".