231318453 has 4 divisors (see below), whose sum is σ = 308424608. Its totient is φ = 154212300.

The previous prime is 231318449. The next prime is 231318463. The reversal of 231318453 is 354813132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231318453 - 2² = 231318449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231318453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231318463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38553073 + ... + 38553078.

It is an arithmetic number, because the mean of its divisors is an integer number (77106152).

Almost surely, 2^231318453 is an apocalyptic number.

It is an amenable number.

231318453 is a deficient number, since it is larger than the sum of its proper divisors (77106155).

231318453 is an equidigital number, since it uses as much as digits as its factorization.

231318453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77106154.

The product of its digits is 8640, while the sum is 30.

The square root of 231318453 is about 15209.1568799852. The cubic root of 231318453 is about 613.8610714260.

The spelling of 231318453 in words is "two hundred thirty-one million, three hundred eighteen thousand, four hundred fifty-three".