1691941945 has 8 divisors (see below), whose sum is σ = 2038826880. Its totient is φ = 1347889200.

The previous prime is 1691941931. The next prime is 1691941961. The reversal of 1691941945 is 5491491961.

1691941945 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1691941945 - 2¹¹ = 1691939897 is a prime.

It is an unprimeable number.

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, 706731 + ... + 709120.

It is an arithmetic number, because the mean of its divisors is an integer number (254853360).

Almost surely, 2^1691941945 is an apocalyptic number.

It is an amenable number.

1691941945 is a deficient number, since it is larger than the sum of its proper divisors (346884935).

1691941945 is a wasteful number, since it uses less digits than its factorization.

1691941945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416095.

The product of its digits is 349920, while the sum is 49.

The square root of 1691941945 is about 41133.2219136795. The cubic root of 1691941945 is about 1191.5944882903.

The spelling of 1691941945 in words is "one billion, six hundred ninety-one million, nine hundred forty-one thousand, nine hundred forty-five".