121535191 has 4 divisors (see below), whose sum is σ = 127931800. Its totient is φ = 115138584.

The previous prime is 121535189. The next prime is 121535203. The reversal of 121535191 is 191535121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191535121 = 3793 ⋅50497.

It is a cyclic number.

It is not a de Polignac number, because 121535191 - 2¹ = 121535189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121535131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3198276 + ... + 3198313.

It is an arithmetic number, because the mean of its divisors is an integer number (31982950).

Almost surely, 2^121535191 is an apocalyptic number.

121535191 is a deficient number, since it is larger than the sum of its proper divisors (6396609).

121535191 is an equidigital number, since it uses as much as digits as its factorization.

121535191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6396608.

The product of its digits is 1350, while the sum is 28.

The square root of 121535191 is about 11024.3000231307. The cubic root of 121535191 is about 495.3369008754.

The spelling of 121535191 in words is "one hundred twenty-one million, five hundred thirty-five thousand, one hundred ninety-one".