254403561 has 4 divisors (see below), whose sum is σ = 339204752. Its totient is φ = 169602372.

The previous prime is 254403557. The next prime is 254403581. The reversal of 254403561 is 165304452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 254403561 - 2² = 254403557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (254403581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42400591 + ... + 42400596.

It is an arithmetic number, because the mean of its divisors is an integer number (84801188).

Almost surely, 2^254403561 is an apocalyptic number.

It is an amenable number.

254403561 is a deficient number, since it is larger than the sum of its proper divisors (84801191).

254403561 is an equidigital number, since it uses as much as digits as its factorization.

254403561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84801190.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 254403561 is about 15950.0332601534. The cubic root of 254403561 is about 633.6377775141.

The spelling of 254403561 in words is "two hundred fifty-four million, four hundred three thousand, five hundred sixty-one".