654981 has 8 divisors (see below), whose sum is σ = 881760. Its totient is φ = 432432.

The previous prime is 654967. The next prime is 654991. The reversal of 654981 is 189456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 654981 - 2⁶ = 654917 is a prime.

It is a super-2 number, since 2×654981² = 858000220722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

654981 is a modest number, since divided by 981 gives 654 as remainder.

It is a Curzon number.

654981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (110220).

2⁶⁵⁴⁹⁸¹ is an apocalyptic number.

It is an amenable number.

654981 is a deficient number, since it is larger than the sum of its proper divisors (226779).

654981 is a wasteful number, since it uses less digits than its factorization.

654981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115.

The product of its digits is 8640, while the sum is 33.

The square root of 654981 is about 809.3089644876. The cubic root of 654981 is about 86.8446162920.

The spelling of 654981 in words is "six hundred fifty-four thousand, nine hundred eighty-one".