2005257161 has 2 divisors, whose sum is σ = 2005257162. Its totient is φ = 2005257160.

The previous prime is 2005257097. The next prime is 2005257179. The reversal of 2005257161 is 1617525002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600000000 + 405257161 = 40000^2 + 20131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005257161 - 2⁶ = 2005257097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2005257181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002628580 + 1002628581.

It is an arithmetic number, because the mean of its divisors is an integer number (1002628581).

Almost surely, 2^2005257161 is an apocalyptic number.

It is an amenable number.

2005257161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005257161 is an equidigital number, since it uses as much as digits as its factorization.

2005257161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 2005257161 is about 44780.0978225819. The cubic root of 2005257161 is about 1261.0240186790.

The spelling of 2005257161 in words is "two billion, five million, two hundred fifty-seven thousand, one hundred sixty-one".