1791681385 has 24 divisors (see below), whose sum is σ = 2331624960. Its totient is φ = 1321100352.

The previous prime is 1791681383. The next prime is 1791681389. The reversal of 1791681385 is 5831861971.

It is a happy number.

It is not a de Polignac number, because 1791681385 - 2¹ = 1791681383 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1791681383) 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 23 ways as a sum of consecutive naturals, for example, 799096 + ... + 801334.

It is an arithmetic number, because the mean of its divisors is an integer number (97151040).

Almost surely, 2^1791681385 is an apocalyptic number.

It is an amenable number.

1791681385 is a deficient number, since it is larger than the sum of its proper divisors (539943575).

1791681385 is a wasteful number, since it uses less digits than its factorization.

1791681385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3204 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 1791681385 is about 42328.2575237866. The cubic root of 1791681385 is about 1214.5635976683.

The spelling of 1791681385 in words is "one billion, seven hundred ninety-one million, six hundred eighty-one thousand, three hundred eighty-five".