1605217441 has 2 divisors, whose sum is σ = 1605217442. Its totient is φ = 1605217440.

The previous prime is 1605217421. The next prime is 1605217457. The reversal of 1605217441 is 1447125061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1389127441 + 216090000 = 37271^2 + 14700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605217441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605217421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802608720 + 802608721.

It is an arithmetic number, because the mean of its divisors is an integer number (802608721).

Almost surely, 2^1605217441 is an apocalyptic number.

It is an amenable number.

1605217441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605217441 is an equidigital number, since it uses as much as digits as its factorization.

1605217441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1605217441 is about 40065.1649316460. The cubic root of 1605217441 is about 1170.8770400652.

The spelling of 1605217441 in words is "one billion, six hundred five million, two hundred seventeen thousand, four hundred forty-one".