1641892891 has 2 divisors, whose sum is σ = 1641892892. Its totient is φ = 1641892890.

The previous prime is 1641892867. The next prime is 1641892921. The reversal of 1641892891 is 1982981461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641892891 - 2⁹ = 1641892379 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641892831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820946445 + 820946446.

It is an arithmetic number, because the mean of its divisors is an integer number (820946446).

Almost surely, 2^1641892891 is an apocalyptic number.

1641892891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641892891 is an equidigital number, since it uses as much as digits as its factorization.

1641892891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 49.

The square root of 1641892891 is about 40520.2775286646. The cubic root of 1641892891 is about 1179.7272401732.

The spelling of 1641892891 in words is "one billion, six hundred forty-one million, eight hundred ninety-two thousand, eight hundred ninety-one".