1605261271 has 2 divisors, whose sum is σ = 1605261272. Its totient is φ = 1605261270.

The previous prime is 1605261253. The next prime is 1605261311. The reversal of 1605261271 is 1721625061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605261271 - 2⁷ = 1605261143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605201271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802630635 + 802630636.

It is an arithmetic number, because the mean of its divisors is an integer number (802630636).

Almost surely, 2^1605261271 is an apocalyptic number.

1605261271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605261271 is an equidigital number, since it uses as much as digits as its factorization.

1605261271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1605261271 is about 40065.7119118081. The cubic root of 1605261271 is about 1170.8876967884.

The spelling of 1605261271 in words is "one billion, six hundred five million, two hundred sixty-one thousand, two hundred seventy-one".