254618921 has 4 divisors (see below), whose sum is σ = 255176532. Its totient is φ = 254061312.

The previous prime is 254618909. The next prime is 254618929. The reversal of 254618921 is 129816452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 121793296 + 132825625 = 11036^2 + 11525^2 .

It is a cyclic number.

It is not a de Polignac number, because 254618921 - 2⁶ = 254618857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (254618929) 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, 278120 + ... + 279033.

It is an arithmetic number, because the mean of its divisors is an integer number (63794133).

Almost surely, 2^254618921 is an apocalyptic number.

It is an amenable number.

254618921 is a deficient number, since it is larger than the sum of its proper divisors (557611).

254618921 is an equidigital number, since it uses as much as digits as its factorization.

254618921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557610.

The product of its digits is 34560, while the sum is 38.

The square root of 254618921 is about 15956.7829151117. The cubic root of 254618921 is about 633.8165246766.

The spelling of 254618921 in words is "two hundred fifty-four million, six hundred eighteen thousand, nine hundred twenty-one".