231004421 has 2 divisors, whose sum is σ = 231004422. Its totient is φ = 231004420.

The previous prime is 231004399. The next prime is 231004439. The reversal of 231004421 is 124400132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226653025 + 4351396 = 15055^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 231004421 - 2¹⁰ = 231003397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231004421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231004121) 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 as a sum of consecutive naturals, namely, 115502210 + 115502211.

It is an arithmetic number, because the mean of its divisors is an integer number (115502211).

Almost surely, 2^231004421 is an apocalyptic number.

It is an amenable number.

231004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

231004421 is an equidigital number, since it uses as much as digits as its factorization.

231004421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231004421 is about 15198.8295930970. The cubic root of 231004421 is about 613.5831582758.

Adding to 231004421 its reverse (124400132), we get a palindrome (355404553).

The spelling of 231004421 in words is "two hundred thirty-one million, four thousand, four hundred twenty-one".