1694045905 has 4 divisors (see below), whose sum is σ = 2032855092. Its totient is φ = 1355236720.

The previous prime is 1694045879. The next prime is 1694045921. The reversal of 1694045905 is 5095404961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5095404961 = 21019 ⋅242419.

It can be written as a sum of positive squares in 2 ways, for example, as 1107292176 + 586753729 = 33276^2 + 24223^2 .

It is not a de Polignac number, because 1694045905 - 2²⁷ = 1559828177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169404586 + ... + 169404595.

It is an arithmetic number, because the mean of its divisors is an integer number (508213773).

Almost surely, 2^1694045905 is an apocalyptic number.

It is an amenable number.

1694045905 is a deficient number, since it is larger than the sum of its proper divisors (338809187).

1694045905 is an equidigital number, since it uses as much as digits as its factorization.

1694045905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338809186.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 1694045905 is about 41158.7889156132. The cubic root of 1694045905 is about 1192.0882067006.

The spelling of 1694045905 in words is "one billion, six hundred ninety-four million, forty-five thousand, nine hundred five".