1646861353 has 2 divisors, whose sum is σ = 1646861354. Its totient is φ = 1646861352.

The previous prime is 1646861339. The next prime is 1646861357. The reversal of 1646861353 is 3531686461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1396367424 + 250493929 = 37368^2 + 15827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646861353 - 2⁹ = 1646860841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1646861357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823430676 + 823430677.

It is an arithmetic number, because the mean of its divisors is an integer number (823430677).

Almost surely, 2^1646861353 is an apocalyptic number.

It is an amenable number.

1646861353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646861353 is an equidigital number, since it uses as much as digits as its factorization.

1646861353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 1646861353 is about 40581.5395592627. The cubic root of 1646861353 is about 1180.9160159604.

The spelling of 1646861353 in words is "one billion, six hundred forty-six million, eight hundred sixty-one thousand, three hundred fifty-three".