231020413 has 4 divisors (see below), whose sum is σ = 248791228. Its totient is φ = 213249600.

The previous prime is 231020371. The next prime is 231020417. The reversal of 231020413 is 314020132.

It is a happy number.

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 32012964 + 199007449 = 5658^2 + 14107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231020413 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 (231020417) 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, 8885388 + ... + 8885413.

It is an arithmetic number, because the mean of its divisors is an integer number (62197807).

Almost surely, 2^231020413 is an apocalyptic number.

It is an amenable number.

231020413 is a deficient number, since it is larger than the sum of its proper divisors (17770815).

231020413 is a wasteful number, since it uses less digits than its factorization.

231020413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17770814.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231020413 is about 15199.3556771332. The cubic root of 231020413 is about 613.5973170170.

Adding to 231020413 its reverse (314020132), we get a palindrome (545040545).

The spelling of 231020413 in words is "two hundred thirty-one million, twenty thousand, four hundred thirteen".