121796191 has 4 divisors (see below), whose sum is σ = 132868584. Its totient is φ = 110723800.

The previous prime is 121796183. The next prime is 121796197. The reversal of 121796191 is 191697121.

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

It is not a de Polignac number, because 121796191 - 2³ = 121796183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121796191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121796197) 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, 5536180 + ... + 5536201.

It is an arithmetic number, because the mean of its divisors is an integer number (33217146).

Almost surely, 2^121796191 is an apocalyptic number.

121796191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121796191 is a deficient number, since it is larger than the sum of its proper divisors (11072393).

121796191 is a wasteful number, since it uses less digits than its factorization.

121796191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072392.

The product of its digits is 6804, while the sum is 37.

The square root of 121796191 is about 11036.1311608734. The cubic root of 121796191 is about 495.6912303339.

The spelling of 121796191 in words is "one hundred twenty-one million, seven hundred ninety-six thousand, one hundred ninety-one".