1691805797 has 16 divisors (see below), whose sum is σ = 1913937792. Its totient is φ = 1481872320.

The previous prime is 1691805757. The next prime is 1691805883. The reversal of 1691805797 is 7975081961.

It is a cyclic number.

It is not a de Polignac number, because 1691805797 - 2¹⁰ = 1691804773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691805727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21743 + ... + 62099.

It is an arithmetic number, because the mean of its divisors is an integer number (119621112).

Almost surely, 2^1691805797 is an apocalyptic number.

It is an amenable number.

1691805797 is a deficient number, since it is larger than the sum of its proper divisors (222131995).

1691805797 is a wasteful number, since it uses less digits than its factorization.

1691805797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40508.

The product of its (nonzero) digits is 952560, while the sum is 53.

The square root of 1691805797 is about 41131.5669164208. The cubic root of 1691805797 is about 1191.5625254997.

The spelling of 1691805797 in words is "one billion, six hundred ninety-one million, eight hundred five thousand, seven hundred ninety-seven".