231534553 has 2 divisors, whose sum is σ = 231534554. Its totient is φ = 231534552.

The previous prime is 231534547. The next prime is 231534557. The reversal of 231534553 is 355435132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229916569 + 1617984 = 15163^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 231534553 - 2¹⁷ = 231403481 is a prime.

It is not a weakly prime, because it can be changed into another prime (231534557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115767276 + 115767277.

It is an arithmetic number, because the mean of its divisors is an integer number (115767277).

Almost surely, 2^231534553 is an apocalyptic number.

It is an amenable number.

231534553 is a deficient number, since it is larger than the sum of its proper divisors (1).

231534553 is an equidigital number, since it uses as much as digits as its factorization.

231534553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 31.

The square root of 231534553 is about 15216.2594943698. The cubic root of 231534553 is about 614.0521703028.

Adding to 231534553 its reverse (355435132), we get a palindrome (586969685).

The spelling of 231534553 in words is "two hundred thirty-one million, five hundred thirty-four thousand, five hundred fifty-three".