231628493 has 2 divisors, whose sum is σ = 231628494. Its totient is φ = 231628492.

The previous prime is 231628477. The next prime is 231628511. The reversal of 231628493 is 394826132.

231628493 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168298729 + 63329764 = 12973^2 + 7958^2 .

It is a cyclic number.

It is not a de Polignac number, because 231628493 - 2⁴ = 231628477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231628433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115814246 + 115814247.

It is an arithmetic number, because the mean of its divisors is an integer number (115814247).

Almost surely, 2^231628493 is an apocalyptic number.

It is an amenable number.

231628493 is a deficient number, since it is larger than the sum of its proper divisors (1).

231628493 is an equidigital number, since it uses as much as digits as its factorization.

231628493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 231628493 is about 15219.3460109165. The cubic root of 231628493 is about 614.1352050818.

The spelling of 231628493 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, four hundred ninety-three".