121891071 has 8 divisors (see below), whose sum is σ = 172081584. Its totient is φ = 76480640.

The previous prime is 121891067. The next prime is 121891079. The reversal of 121891071 is 170198121.

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 121891071 - 2² = 121891067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121891079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194960 + ... + 1195061.

It is an arithmetic number, because the mean of its divisors is an integer number (21510198).

Almost surely, 2^121891071 is an apocalyptic number.

121891071 is a deficient number, since it is larger than the sum of its proper divisors (50190513).

121891071 is a wasteful number, since it uses less digits than its factorization.

121891071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390041.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 121891071 is about 11040.4289318848. The cubic root of 121891071 is about 495.8199124552.

The spelling of 121891071 in words is "one hundred twenty-one million, eight hundred ninety-one thousand, seventy-one".