121906081 has 4 divisors (see below), whose sum is σ = 132988464. Its totient is φ = 110823700.

The previous prime is 121906073. The next prime is 121906093. The reversal of 121906081 is 180609121.

It is a happy number.

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 121906081 - 2³ = 121906073 is a prime.

It is a super-2 number, since 2×121906081² = 29722185169557122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121906381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5541175 + ... + 5541196.

It is an arithmetic number, because the mean of its divisors is an integer number (33247116).

Almost surely, 2^121906081 is an apocalyptic number.

121906081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121906081 is a deficient number, since it is larger than the sum of its proper divisors (11082383).

121906081 is a wasteful number, since it uses less digits than its factorization.

121906081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082382.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 121906081 is about 11041.1086852725. The cubic root of 121906081 is about 495.8402638267.

It can be divided in two parts, 1219060 and 81, that added together give a triangular number (1219141 = T₁₅₆₁).

The spelling of 121906081 in words is "one hundred twenty-one million, nine hundred six thousand, eighty-one".