654661081 has 2 divisors, whose sum is σ = 654661082. Its totient is φ = 654661080.

The previous prime is 654661067. The next prime is 654661123. The reversal of 654661081 is 180166456.

654661081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562116681 + 92544400 = 23709^2 + 9620^2 .

It is a cyclic number.

It is not a de Polignac number, because 654661081 - 2¹⁵ = 654628313 is a prime.

It is a super-2 number, since 2×654661081² = 857162261952177122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 654661081.

It is not a weakly prime, because it can be changed into another prime (654661061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327330540 + 327330541.

It is an arithmetic number, because the mean of its divisors is an integer number (327330541).

Almost surely, 2^654661081 is an apocalyptic number.

It is an amenable number.

654661081 is a deficient number, since it is larger than the sum of its proper divisors (1).

654661081 is an equidigital number, since it uses as much as digits as its factorization.

654661081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 654661081 is about 25586.3455968218. The cubic root of 654661081 is about 868.3047452427.

The spelling of 654661081 in words is "six hundred fifty-four million, six hundred sixty-one thousand, eighty-one".