121442591 has 8 divisors (see below), whose sum is σ = 123849600. Its totient is φ = 119047320.

The previous prime is 121442561. The next prime is 121442603. The reversal of 121442591 is 195244121.

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 121442591 - 2¹⁸ = 121180447 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 (121442561) 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, 19646 + ... + 25076.

It is an arithmetic number, because the mean of its divisors is an integer number (15481200).

Almost surely, 2^121442591 is an apocalyptic number.

121442591 is a deficient number, since it is larger than the sum of its proper divisors (2407009).

121442591 is an equidigital number, since it uses as much as digits as its factorization.

121442591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869.

The product of its digits is 2880, while the sum is 29.

The square root of 121442591 is about 11020.0994097150. The cubic root of 121442591 is about 495.2110666736.

The spelling of 121442591 in words is "one hundred twenty-one million, four hundred forty-two thousand, five hundred ninety-one".