1693126681 has 2 divisors, whose sum is σ = 1693126682. Its totient is φ = 1693126680.

The previous prime is 1693126621. The next prime is 1693126709. The reversal of 1693126681 is 1866213961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1637011600 + 56115081 = 40460^2 + 7491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1693126681 - 2¹³ = 1693118489 is a prime.

It is a super-2 number, since 2×1693126681² = 5733355915828151522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1693126601) 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, 846563340 + 846563341.

It is an arithmetic number, because the mean of its divisors is an integer number (846563341).

Almost surely, 2^1693126681 is an apocalyptic number.

It is an amenable number.

1693126681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1693126681 is an equidigital number, since it uses as much as digits as its factorization.

1693126681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 1693126681 is about 41147.6205994952. The cubic root of 1693126681 is about 1191.8725505316.

The spelling of 1693126681 in words is "one billion, six hundred ninety-three million, one hundred twenty-six thousand, six hundred eighty-one".