231628433 has 2 divisors, whose sum is σ = 231628434. Its totient is φ = 231628432.

The previous prime is 231628421. The next prime is 231628457. The reversal of 231628433 is 334826132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166616464 + 65011969 = 12908^2 + 8063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231628433 is a prime.

It is equal to p_12727247 and since 231628433 and 12727247 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231628433.

It is not a weakly prime, because it can be changed into another prime (231628493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115814216 + 115814217.

It is an arithmetic number, because the mean of its divisors is an integer number (115814217).

Almost surely, 2^231628433 is an apocalyptic number.

It is an amenable number.

231628433 is a deficient number, since it is larger than the sum of its proper divisors (1).

231628433 is an equidigital number, since it uses as much as digits as its factorization.

231628433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 231628433 is about 15219.3440397410. The cubic root of 231628433 is about 614.1351520541.

The spelling of 231628433 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, four hundred thirty-three".