231823421 has 2 divisors, whose sum is σ = 231823422. Its totient is φ = 231823420.

The previous prime is 231823391. The next prime is 231823429. The reversal of 231823421 is 124328132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231374521 + 448900 = 15211^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 231823421 - 2⁶ = 231823357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231823429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115911710 + 115911711.

It is an arithmetic number, because the mean of its divisors is an integer number (115911711).

Almost surely, 2^231823421 is an apocalyptic number.

It is an amenable number.

231823421 is a deficient number, since it is larger than the sum of its proper divisors (1).

231823421 is an equidigital number, since it uses as much as digits as its factorization.

231823421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 231823421 is about 15225.7486187051. The cubic root of 231823421 is about 614.3074328590.

The spelling of 231823421 in words is "two hundred thirty-one million, eight hundred twenty-three thousand, four hundred twenty-one".