1609695091 has 2 divisors, whose sum is σ = 1609695092. Its totient is φ = 1609695090.

The previous prime is 1609695079. The next prime is 1609695103. The reversal of 1609695091 is 1905969061.

It is a balanced prime because it is at equal distance from previous prime (1609695079) and next prime (1609695103).

It is a cyclic number.

It is not a de Polignac number, because 1609695091 - 2²⁷ = 1475477363 is a prime.

It is a super-2 number, since 2×1609695091² = 5182236571978996562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1609695011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804847545 + 804847546.

It is an arithmetic number, because the mean of its divisors is an integer number (804847546).

Almost surely, 2^1609695091 is an apocalyptic number.

1609695091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609695091 is an equidigital number, since it uses as much as digits as its factorization.

1609695091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 1609695091 is about 40121.0056080353. The cubic root of 1609695091 is about 1171.9647245515.

The spelling of 1609695091 in words is "one billion, six hundred nine million, six hundred ninety-five thousand, ninety-one".