1643060257 has 2 divisors, whose sum is σ = 1643060258. Its totient is φ = 1643060256.

The previous prime is 1643060191. The next prime is 1643060291. The reversal of 1643060257 is 7520603461.

It is a happy number.

It is an a-pointer prime, because the next prime (1643060291) can be obtained adding 1643060257 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1617970176 + 25090081 = 40224^2 + 5009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643060257 - 2¹⁹ = 1642535969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643060857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821530128 + 821530129.

It is an arithmetic number, because the mean of its divisors is an integer number (821530129).

Almost surely, 2^1643060257 is an apocalyptic number.

It is an amenable number.

1643060257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643060257 is an equidigital number, since it uses as much as digits as its factorization.

1643060257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 1643060257 is about 40534.6796829579. The cubic root of 1643060257 is about 1180.0067645404.

The spelling of 1643060257 in words is "one billion, six hundred forty-three million, sixty thousand, two hundred fifty-seven".