857401121 has 4 divisors (see below), whose sum is σ = 860959044. Its totient is φ = 853843200.

The previous prime is 857401099. The next prime is 857401159. The reversal of 857401121 is 121104758.

857401121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 543402721 + 313998400 = 23311^2 + 17720^2 .

It is a cyclic number.

It is not a de Polignac number, because 857401121 - 2¹⁰ = 857400097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857401621) 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, 1778600 + ... + 1779081.

It is an arithmetic number, because the mean of its divisors is an integer number (215239761).

Almost surely, 2^857401121 is an apocalyptic number.

It is an amenable number.

857401121 is a deficient number, since it is larger than the sum of its proper divisors (3557923).

857401121 is a wasteful number, since it uses less digits than its factorization.

857401121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557922.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 857401121 is about 29281.4125513097. The cubic root of 857401121 is about 950.0096475475.

Adding to 857401121 its reverse (121104758), we get a palindrome (978505879).

The spelling of 857401121 in words is "eight hundred fifty-seven million, four hundred one thousand, one hundred twenty-one".