1641071309 has 2 divisors, whose sum is σ = 1641071310. Its totient is φ = 1641071308.

The previous prime is 1641071281. The next prime is 1641071347. The reversal of 1641071309 is 9031701461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1175461225 + 465610084 = 34285^2 + 21578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641071309 - 2²⁰ = 1640022733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641071389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820535654 + 820535655.

It is an arithmetic number, because the mean of its divisors is an integer number (820535655).

Almost surely, 2^1641071309 is an apocalyptic number.

It is an amenable number.

1641071309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641071309 is an equidigital number, since it uses as much as digits as its factorization.

1641071309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1641071309 is about 40510.1383483197. The cubic root of 1641071309 is about 1179.5304339176.

The spelling of 1641071309 in words is "one billion, six hundred forty-one million, seventy-one thousand, three hundred nine".