121409081 has 4 divisors (see below), whose sum is σ = 124232592. Its totient is φ = 118585572.

The previous prime is 121409047. The next prime is 121409191. The reversal of 121409081 is 180904121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 180904121 = 421 ⋅429701.

It is not a de Polignac number, because 121409081 - 2¹⁸ = 121146937 is a prime.

It is a super-2 number, since 2×121409081² = 29480329898529122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121409081.

It is not an unprimeable number, because it can be changed into a prime (121409681) 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, 1411691 + ... + 1411776.

It is an arithmetic number, because the mean of its divisors is an integer number (31058148).

Almost surely, 2^121409081 is an apocalyptic number.

It is an amenable number.

121409081 is a deficient number, since it is larger than the sum of its proper divisors (2823511).

121409081 is an equidigital number, since it uses as much as digits as its factorization.

121409081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823510.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 121409081 is about 11018.5789011106. The cubic root of 121409081 is about 495.1655141502.

The spelling of 121409081 in words is "one hundred twenty-one million, four hundred nine thousand, eighty-one".