191417121 has 16 divisors (see below), whose sum is σ = 324092800. Its totient is φ = 109381104.

The previous prime is 191417117. The next prime is 191417129. The reversal of 191417121 is 121714191.

It is not a de Polignac number, because 191417121 - 2² = 191417117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191417129) 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 15 ways as a sum of consecutive naturals, for example, 506206 + ... + 506583.

It is an arithmetic number, because the mean of its divisors is an integer number (20255800).

Almost surely, 2^191417121 is an apocalyptic number.

It is an amenable number.

191417121 is a deficient number, since it is larger than the sum of its proper divisors (132675679).

191417121 is a wasteful number, since it uses less digits than its factorization.

191417121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012805 (or 1012799 counting only the distinct ones).

The product of its digits is 504, while the sum is 27.

The square root of 191417121 is about 13835.3576390349. The cubic root of 191417121 is about 576.3154467885.

It can be divided in two parts, 19141 and 7121, that added together give a palindrome (26262).

The spelling of 191417121 in words is "one hundred ninety-one million, four hundred seventeen thousand, one hundred twenty-one".