1609696091 has 6 divisors (see below), whose sum is σ = 1644675900. Its totient is φ = 1575445076.

The previous prime is 1609696057. The next prime is 1609696141. The reversal of 1609696091 is 1906969061.

It is not a de Polignac number, because 1609696091 - 2¹⁴ = 1609679707 is a prime.

It is a super-2 number, since 2×1609696091² = 5182243010761360562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

1609696091 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609695091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 362141 + ... + 366558.

It is an arithmetic number, because the mean of its divisors is an integer number (274112650).

Almost surely, 2^1609696091 is an apocalyptic number.

1609696091 is a deficient number, since it is larger than the sum of its proper divisors (34979809).

1609696091 is an frugal number, since it uses more digits than its factorization.

1609696091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728793 (or 728746 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 1609696091 is about 40121.0180703332. The cubic root of 1609696091 is about 1171.9649672402.

The spelling of 1609696091 in words is "one billion, six hundred nine million, six hundred ninety-six thousand, ninety-one".