231640553 has 8 divisors (see below), whose sum is σ = 235535040. Its totient is φ = 227763760.

The previous prime is 231640547. The next prime is 231640573. The reversal of 231640553 is 355046132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231640553 - 2⁴ = 231640537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231640573) 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 7 ways as a sum of consecutive naturals, for example, 23426 + ... + 31812.

It is an arithmetic number, because the mean of its divisors is an integer number (29441880).

Almost surely, 2^231640553 is an apocalyptic number.

It is an amenable number.

231640553 is a deficient number, since it is larger than the sum of its proper divisors (3894487).

231640553 is an equidigital number, since it uses as much as digits as its factorization.

231640553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8847.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 231640553 is about 15219.7422120087. The cubic root of 231640553 is about 614.1458634453.

Adding to 231640553 its reverse (355046132), we get a palindrome (586686685).

The spelling of 231640553 in words is "two hundred thirty-one million, six hundred forty thousand, five hundred fifty-three".