1169891421 has 4 divisors (see below), whose sum is σ = 1559855232. Its totient is φ = 779927612.

The previous prime is 1169891323. The next prime is 1169891447. The reversal of 1169891421 is 1241989611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1169891421 - 2¹¹ = 1169889373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1169891321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194981901 + ... + 194981906.

It is an arithmetic number, because the mean of its divisors is an integer number (389963808).

Almost surely, 2^1169891421 is an apocalyptic number.

It is an amenable number.

1169891421 is a deficient number, since it is larger than the sum of its proper divisors (389963811).

1169891421 is an equidigital number, since it uses as much as digits as its factorization.

1169891421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389963810.

The product of its digits is 31104, while the sum is 42.

The square root of 1169891421 is about 34203.6755481045. The cubic root of 1169891421 is about 1053.6956457936.

The spelling of 1169891421 in words is "one billion, one hundred sixty-nine million, eight hundred ninety-one thousand, four hundred twenty-one".