121085857 has 4 divisors (see below), whose sum is σ = 121165380. Its totient is φ = 121006336.

The previous prime is 121085851. The next prime is 121085891. The reversal of 121085857 is 758580121.

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 41679936 + 79405921 = 6456^2 + 8911^2 .

It is a cyclic number.

It is not a de Polignac number, because 121085857 - 2¹⁵ = 121053089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121085851) 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, 37432 + ... + 40537.

It is an arithmetic number, because the mean of its divisors is an integer number (30291345).

Almost surely, 2^121085857 is an apocalyptic number.

It is an amenable number.

121085857 is a deficient number, since it is larger than the sum of its proper divisors (79523).

121085857 is an equidigital number, since it uses as much as digits as its factorization.

121085857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79522.

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 121085857 is about 11003.9018988721. The cubic root of 121085857 is about 494.7257018536.

The spelling of 121085857 in words is "one hundred twenty-one million, eighty-five thousand, eight hundred fifty-seven".