254667991 has 4 divisors (see below), whose sum is σ = 254700712. Its totient is φ = 254635272.

The previous prime is 254667989. The next prime is 254668009. The reversal of 254667991 is 199766452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 254667991 - 2¹ = 254667989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254667961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776 + ... + 22738.

It is an arithmetic number, because the mean of its divisors is an integer number (63675178).

Almost surely, 2^254667991 is an apocalyptic number.

254667991 is a deficient number, since it is larger than the sum of its proper divisors (32721).

254667991 is a wasteful number, since it uses less digits than its factorization.

254667991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32720.

The product of its digits is 816480, while the sum is 49.

The square root of 254667991 is about 15958.3204316745. The cubic root of 254667991 is about 633.8572383034.

The spelling of 254667991 in words is "two hundred fifty-four million, six hundred sixty-seven thousand, nine hundred ninety-one".