254431891 has 4 divisors (see below), whose sum is σ = 290779312. Its totient is φ = 218084472.

The previous prime is 254431847. The next prime is 254431921. The reversal of 254431891 is 198134452.

254431891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 254431891 - 2²⁷ = 120214163 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 254431891.

It is not an unprimeable number, because it can be changed into a prime (254431841) 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, 18173700 + ... + 18173713.

It is an arithmetic number, because the mean of its divisors is an integer number (72694828).

Almost surely, 2^254431891 is an apocalyptic number.

254431891 is a deficient number, since it is larger than the sum of its proper divisors (36347421).

254431891 is an equidigital number, since it uses as much as digits as its factorization.

254431891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36347420.

The product of its digits is 34560, while the sum is 37.

The square root of 254431891 is about 15950.9213213532. The cubic root of 254431891 is about 633.6612969594.

The spelling of 254431891 in words is "two hundred fifty-four million, four hundred thirty-one thousand, eight hundred ninety-one".