121862005 has 4 divisors (see below), whose sum is σ = 146234412. Its totient is φ = 97489600.

The previous prime is 121861997. The next prime is 121862009. The reversal of 121862005 is 500268121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500268121 = 107 ⋅4675403.

It can be written as a sum of positive squares in 2 ways, for example, as 23415921 + 98446084 = 4839^2 + 9922^2 .

It is not a de Polignac number, because 121862005 - 2³ = 121861997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121862009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12186196 + ... + 12186205.

It is an arithmetic number, because the mean of its divisors is an integer number (36558603).

Almost surely, 2^121862005 is an apocalyptic number.

It is an amenable number.

121862005 is a deficient number, since it is larger than the sum of its proper divisors (24372407).

121862005 is an equidigital number, since it uses as much as digits as its factorization.

121862005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24372406.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 121862005 is about 11039.1125096178. The cubic root of 121862005 is about 495.7804984464.

The spelling of 121862005 in words is "one hundred twenty-one million, eight hundred sixty-two thousand, five".