121191490559 has 4 divisors (see below), whose sum is σ = 121192528704. Its totient is φ = 121190452416.

The previous prime is 121191490547. The next prime is 121191490583. The reversal of 121191490559 is 955094191121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 955094191121 = 7 ⋅136442027303.

It is a cyclic number.

It is not a de Polignac number, because 121191490559 - 2²⁴ = 121174713343 is a prime.

It is a super-2 number, since 2×121191490559² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121191490529) 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, 318002 + ... + 586095.

It is an arithmetic number, because the mean of its divisors is an integer number (30298132176).

Almost surely, 2^121191490559 is an apocalyptic number.

121191490559 is a deficient number, since it is larger than the sum of its proper divisors (1038145).

121191490559 is an equidigital number, since it uses as much as digits as its factorization.

121191490559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038144.

The product of its (nonzero) digits is 145800, while the sum is 47.

The spelling of 121191490559 in words is "one hundred twenty-one billion, one hundred ninety-one million, four hundred ninety thousand, five hundred fifty-nine".