1688501377 has 2 divisors, whose sum is σ = 1688501378. Its totient is φ = 1688501376.

The previous prime is 1688501363. The next prime is 1688501389. The reversal of 1688501377 is 7731058861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1392110721 + 296390656 = 37311^2 + 17216^2 .

It is an emirp because it is prime and its reverse (7731058861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688501377 is a prime.

It is a super-2 number, since 2×1688501377² = 5702073800261792258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1688501317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844250688 + 844250689.

It is an arithmetic number, because the mean of its divisors is an integer number (844250689).

Almost surely, 2^1688501377 is an apocalyptic number.

It is an amenable number.

1688501377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688501377 is an equidigital number, since it uses as much as digits as its factorization.

1688501377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 1688501377 is about 41091.3783779517. The cubic root of 1688501377 is about 1190.7862367661.

The spelling of 1688501377 in words is "one billion, six hundred eighty-eight million, five hundred one thousand, three hundred seventy-seven".