1691466993 has 12 divisors (see below), whose sum is σ = 2445202500. Its totient is φ = 1126734336.

The previous prime is 1691466979. The next prime is 1691467007. The reversal of 1691466993 is 3996641961.

1691466993 is a `hidden beast` number, since 1 + 6 + 91 + 466 + 9 + 93 = 666.

It is an interprime number because it is at equal distance from previous prime (1691466979) and next prime (1691467007).

It can be written as a sum of positive squares in 2 ways, for example, as 699972849 + 991494144 = 26457^2 + 31488^2 .

It is not a de Polignac number, because 1691466993 - 2⁴ = 1691466977 is a prime.

It is a super-2 number, since 2×1691466993² = 5722121176816924098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1691466893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63996 + ... + 86477.

It is an arithmetic number, because the mean of its divisors is an integer number (203766875).

Almost surely, 2^1691466993 is an apocalyptic number.

It is an amenable number.

1691466993 is a deficient number, since it is larger than the sum of its proper divisors (753735507).

1691466993 is a wasteful number, since it uses less digits than its factorization.

1691466993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151728 (or 151725 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 1691466993 is about 41127.4481702913. The cubic root of 1691466993 is about 1191.4829787214.

The spelling of 1691466993 in words is "one billion, six hundred ninety-one million, four hundred sixty-six thousand, nine hundred ninety-three".