230128901 has 4 divisors (see below), whose sum is σ = 231808812. Its totient is φ = 228448992.

The previous prime is 230128897. The next prime is 230128909. The reversal of 230128901 is 109821032.

It is a Cunningham number, because it is equal to 15170²+1.

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 135163876 + 94965025 = 11626^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 230128901 - 2² = 230128897 is a prime.

It is a super-2 number, since 2×230128901² = 105918622150935602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230128909) 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, 839750 + ... + 840023.

It is an arithmetic number, because the mean of its divisors is an integer number (57952203).

Almost surely, 2^230128901 is an apocalyptic number.

It is an amenable number.

230128901 is a deficient number, since it is larger than the sum of its proper divisors (1679911).

230128901 is a wasteful number, since it uses less digits than its factorization.

230128901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679910.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 230128901 is about 15170.0000329598. Note that the first 4 decimals coincide. The cubic root of 230128901 is about 612.8070051103.

Adding to 230128901 its reverse (109821032), we get a palindrome (339949933).

It can be divided in two parts, 23012 and 8901, that added together give a palindrome (31913).

The spelling of 230128901 in words is "two hundred thirty million, one hundred twenty-eight thousand, nine hundred one".