1681769513 has 2 divisors, whose sum is σ = 1681769514. Its totient is φ = 1681769512.

The previous prime is 1681769471. The next prime is 1681769563. The reversal of 1681769513 is 3159671861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1514532889 + 167236624 = 38917^2 + 12932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681769513 - 2¹⁶ = 1681703977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1681769563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840884756 + 840884757.

It is an arithmetic number, because the mean of its divisors is an integer number (840884757).

Almost surely, 2^1681769513 is an apocalyptic number.

It is an amenable number.

1681769513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681769513 is an equidigital number, since it uses as much as digits as its factorization.

1681769513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 1681769513 is about 41009.3832311582. The cubic root of 1681769513 is about 1189.2016189881.

The spelling of 1681769513 in words is "one billion, six hundred eighty-one million, seven hundred sixty-nine thousand, five hundred thirteen".