654321643 has 2 divisors, whose sum is σ = 654321644. Its totient is φ = 654321642.

The previous prime is 654321617. The next prime is 654321667. The reversal of 654321643 is 346123456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654321643 - 2¹⁷ = 654190571 is a prime.

It is a super-3 number, since 3×654321643³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 654321599 and 654321608.

It is not a weakly prime, because it can be changed into another prime (654321673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327160821 + 327160822.

It is an arithmetic number, because the mean of its divisors is an integer number (327160822).

Almost surely, 2^654321643 is an apocalyptic number.

654321643 is a deficient number, since it is larger than the sum of its proper divisors (1).

654321643 is an equidigital number, since it uses as much as digits as its factorization.

654321643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 34.

The square root of 654321643 is about 25579.7115503674. The cubic root of 654321643 is about 868.1546489618.

The spelling of 654321643 in words is "six hundred fifty-four million, three hundred twenty-one thousand, six hundred forty-three".