1641164461 has 2 divisors, whose sum is σ = 1641164462. Its totient is φ = 1641164460.

The previous prime is 1641164449. The next prime is 1641164477. The reversal of 1641164461 is 1644611461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445444361 + 195720100 = 38019^2 + 13990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641164461 - 2¹³ = 1641156269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641134461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820582230 + 820582231.

It is an arithmetic number, because the mean of its divisors is an integer number (820582231).

Almost surely, 2^1641164461 is an apocalyptic number.

It is an amenable number.

1641164461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641164461 is an equidigital number, since it uses as much as digits as its factorization.

1641164461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 1641164461 is about 40511.2880688827. The cubic root of 1641164461 is about 1179.5527513594.

The spelling of 1641164461 in words is "one billion, six hundred forty-one million, one hundred sixty-four thousand, four hundred sixty-one".