1605606473 has 2 divisors, whose sum is σ = 1605606474. Its totient is φ = 1605606472.

The previous prime is 1605606461. The next prime is 1605606479. The reversal of 1605606473 is 3746065061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1072366009 + 533240464 = 32747^2 + 23092^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605606473 - 2⁸ = 1605606217 is a prime.

It is a super-2 number, since 2×1605606473² = 5155944292278999458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1605606479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802803236 + 802803237.

It is an arithmetic number, because the mean of its divisors is an integer number (802803237).

Almost surely, 2^1605606473 is an apocalyptic number.

It is an amenable number.

1605606473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605606473 is an equidigital number, since it uses as much as digits as its factorization.

1605606473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 1605606473 is about 40070.0196281459. The cubic root of 1605606473 is about 1170.9716216116.

The spelling of 1605606473 in words is "one billion, six hundred five million, six hundred six thousand, four hundred seventy-three".