121560091 has 4 divisors (see below), whose sum is σ = 121582384. Its totient is φ = 121537800.

The previous prime is 121560077. The next prime is 121560107. The reversal of 121560091 is 190065121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190065121 = 257 ⋅739553.

It is a cyclic number.

It is not a de Polignac number, because 121560091 - 2⁹ = 121559579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121560071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3121 + ... + 15901.

It is an arithmetic number, because the mean of its divisors is an integer number (30395596).

Almost surely, 2^121560091 is an apocalyptic number.

121560091 is a deficient number, since it is larger than the sum of its proper divisors (22293).

121560091 is an equidigital number, since it uses as much as digits as its factorization.

121560091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22292.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 121560091 is about 11025.4292886944. The cubic root of 121560091 is about 495.3707265970.

The spelling of 121560091 in words is "one hundred twenty-one million, five hundred sixty thousand, ninety-one".