1641120691 has 12 divisors (see below), whose sum is σ = 1909745328. Its totient is φ = 1406169072.

The previous prime is 1641120683. The next prime is 1641120697. The reversal of 1641120691 is 1960211461.

It is not a de Polignac number, because 1641120691 - 2³ = 1641120683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641120697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209650 + ... + 217336.

It is an arithmetic number, because the mean of its divisors is an integer number (159145444).

Almost surely, 2^1641120691 is an apocalyptic number.

1641120691 is a deficient number, since it is larger than the sum of its proper divisors (268624637).

1641120691 is an equidigital number, since it uses as much as digits as its factorization.

1641120691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12058 (or 12051 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1641120691 is about 40510.7478454792. The cubic root of 1641120691 is about 1179.5422650078.

The spelling of 1641120691 in words is "one billion, six hundred forty-one million, one hundred twenty thousand, six hundred ninety-one".