121892081 has 4 divisors (see below), whose sum is σ = 121934964. Its totient is φ = 121849200.

The previous prime is 121892063. The next prime is 121892107. The reversal of 121892081 is 180298121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101687056 + 20205025 = 10084^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 121892081 - 2¹⁰ = 121891057 is a prime.

It is a super-2 number, since 2×121892081² = 29715358821021122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121892021) 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, 16850 + ... + 22971.

It is an arithmetic number, because the mean of its divisors is an integer number (30483741).

Almost surely, 2^121892081 is an apocalyptic number.

It is an amenable number.

121892081 is a deficient number, since it is larger than the sum of its proper divisors (42883).

121892081 is an equidigital number, since it uses as much as digits as its factorization.

121892081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42882.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 121892081 is about 11040.4746727666. The cubic root of 121892081 is about 495.8212819204.

The spelling of 121892081 in words is "one hundred twenty-one million, eight hundred ninety-two thousand, eighty-one".