1641144091 has 2 divisors, whose sum is σ = 1641144092. Its totient is φ = 1641144090.

The previous prime is 1641144077. The next prime is 1641144097. The reversal of 1641144091 is 1904411461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641144091 - 2¹⁷ = 1641013019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641144097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820572045 + 820572046.

It is an arithmetic number, because the mean of its divisors is an integer number (820572046).

Almost surely, 2^1641144091 is an apocalyptic number.

1641144091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641144091 is an equidigital number, since it uses as much as digits as its factorization.

1641144091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1641144091 is about 40511.0366566939. The cubic root of 1641144091 is about 1179.5478711682.

The spelling of 1641144091 in words is "one billion, six hundred forty-one million, one hundred forty-four thousand, ninety-one".