654917261 has 2 divisors, whose sum is σ = 654917262. Its totient is φ = 654917260.

The previous prime is 654917243. The next prime is 654917273. The reversal of 654917261 is 162719456.

654917261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500909161 + 154008100 = 22381^2 + 12410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654917261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654917281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327458630 + 327458631.

It is an arithmetic number, because the mean of its divisors is an integer number (327458631).

Almost surely, 2^654917261 is an apocalyptic number.

It is an amenable number.

654917261 is a deficient number, since it is larger than the sum of its proper divisors (1).

654917261 is an equidigital number, since it uses as much as digits as its factorization.

654917261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 654917261 is about 25591.3512929661. The cubic root of 654917261 is about 868.4179912704.

The spelling of 654917261 in words is "six hundred fifty-four million, nine hundred seventeen thousand, two hundred sixty-one".