1605172229 has 2 divisors, whose sum is σ = 1605172230. Its totient is φ = 1605172228.

The previous prime is 1605172207. The next prime is 1605172237. The reversal of 1605172229 is 9222715061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942367204 + 662805025 = 30698^2 + 25745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605172229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605172279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802586114 + 802586115.

It is an arithmetic number, because the mean of its divisors is an integer number (802586115).

Almost surely, 2^1605172229 is an apocalyptic number.

It is an amenable number.

1605172229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605172229 is an equidigital number, since it uses as much as digits as its factorization.

1605172229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1605172229 is about 40064.6006968745. The cubic root of 1605172229 is about 1170.8660471226.

The spelling of 1605172229 in words is "one billion, six hundred five million, one hundred seventy-two thousand, two hundred twenty-nine".