1681771427 has 8 divisors (see below), whose sum is σ = 2035084896. Its totient is φ = 1356723072.

The previous prime is 1681771423. The next prime is 1681771433. The reversal of 1681771427 is 7241771861.

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 1681771427 - 2² = 1681771423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681771423) 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, 7066148 + ... + 7066385.

It is an arithmetic number, because the mean of its divisors is an integer number (254385612).

Almost surely, 2^1681771427 is an apocalyptic number.

1681771427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1681771427 is a deficient number, since it is larger than the sum of its proper divisors (353313469).

1681771427 is a wasteful number, since it uses less digits than its factorization.

1681771427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14132557.

The product of its digits is 131712, while the sum is 44.

The square root of 1681771427 is about 41009.4065672743. The cubic root of 1681771427 is about 1189.2020701262.

The spelling of 1681771427 in words is "one billion, six hundred eighty-one million, seven hundred seventy-one thousand, four hundred twenty-seven".