231020057 has 8 divisors (see below), whose sum is σ = 235611720. Its totient is φ = 226437120.

The previous prime is 231020051. The next prime is 231020071. The reversal of 231020057 is 750020132.

It can be written as a sum of positive squares in 4 ways, for example, as 27415696 + 203604361 = 5236^2 + 14269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231020057 - 2¹⁸ = 230757913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84569 + ... + 87257.

It is an arithmetic number, because the mean of its divisors is an integer number (29451465).

Almost surely, 2^231020057 is an apocalyptic number.

It is an amenable number.

231020057 is a deficient number, since it is larger than the sum of its proper divisors (4591663).

231020057 is a wasteful number, since it uses less digits than its factorization.

231020057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 231020057 is about 15199.3439661059. The cubic root of 231020057 is about 613.5970018345.

Adding to 231020057 its reverse (750020132), we get a palindrome (981040189).

The spelling of 231020057 in words is "two hundred thirty-one million, twenty thousand, fifty-seven".