1694131681 has 8 divisors (see below), whose sum is σ = 1866443328. Its totient is φ = 1524870000.

The previous prime is 1694131661. The next prime is 1694131687. The reversal of 1694131681 is 1861314961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1694131681 - 2⁷ = 1694131553 is a prime.

It is a super-2 number, since 2×1694131681² = 5740164305135771522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1694131687) 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 7 ways as a sum of consecutive naturals, for example, 761325 + ... + 763546.

It is an arithmetic number, because the mean of its divisors is an integer number (233305416).

Almost surely, 2^1694131681 is an apocalyptic number.

1694131681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1694131681 is a deficient number, since it is larger than the sum of its proper divisors (172311647).

1694131681 is a wasteful number, since it uses less digits than its factorization.

1694131681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524983.

The product of its digits is 31104, while the sum is 40.

The square root of 1694131681 is about 41159.8309155905. The cubic root of 1694131681 is about 1192.1083263507.

The spelling of 1694131681 in words is "one billion, six hundred ninety-four million, one hundred thirty-one thousand, six hundred eighty-one".