121191490561 has 4 divisors (see below), whose sum is σ = 121198168000. Its totient is φ = 121184813124.

The previous prime is 121191490547. The next prime is 121191490583. The reversal of 121191490561 is 165094191121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121191490561 - 2⁵ = 121191490529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121191490501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3311421 + ... + 3347818.

It is an arithmetic number, because the mean of its divisors is an integer number (30299542000).

Almost surely, 2^121191490561 is an apocalyptic number.

It is an amenable number.

121191490561 is a deficient number, since it is larger than the sum of its proper divisors (6677439).

121191490561 is an equidigital number, since it uses as much as digits as its factorization.

121191490561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677438.

The product of its (nonzero) digits is 19440, while the sum is 40.

The spelling of 121191490561 in words is "one hundred twenty-one billion, one hundred ninety-one million, four hundred ninety thousand, five hundred sixty-one".