254689681 has 3 divisors (see below), whose sum is σ = 254705641. Its totient is φ = 254673722.

The previous prime is 254689679. The next prime is 254689691. The reversal of 254689681 is 186986452.

The square root of 254689681 is 15959.

It is a perfect power (a square), and thus also a powerful 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 not a de Polignac number, because 254689681 - 2¹ = 254689679 is a prime.

It is a super-2 number, since 2×254689681² = 129733667215763522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (254689621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7980 + ... + 23938.

Almost surely, 2^254689681 is an apocalyptic number.

254689681 is the 15959-th square number.

254689681 is the 7980-th centered octagonal number.

It is an amenable number.

254689681 is a deficient number, since it is larger than the sum of its proper divisors (15960).

254689681 is an frugal number, since it uses more digits than its factorization.

254689681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31918 (or 15959 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The cubic root of 254689681 is about 633.8752329391.

Multiplying 254689681 by its sum of digits (49), we get a square (12479794369 = 111713²).

The spelling of 254689681 in words is "two hundred fifty-four million, six hundred eighty-nine thousand, six hundred eighty-one".