615240161 has 2 divisors, whose sum is σ = 615240162. Its totient is φ = 615240160.

The previous prime is 615240113. The next prime is 615240193. The reversal of 615240161 is 161042516.

615240161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403246561 + 211993600 = 20081^2 + 14560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615240161 is a prime.

It is a super-3 number, since 3×615240161³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 615240161.

It is not a weakly prime, because it can be changed into another prime (615242161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307620080 + 307620081.

It is an arithmetic number, because the mean of its divisors is an integer number (307620081).

Almost surely, 2^615240161 is an apocalyptic number.

It is an amenable number.

615240161 is a deficient number, since it is larger than the sum of its proper divisors (1).

615240161 is an equidigital number, since it uses as much as digits as its factorization.

615240161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 615240161 is about 24804.0351757532. The cubic root of 615240161 is about 850.5141807107.

Adding to 615240161 its reverse (161042516), we get a palindrome (776282677).

The spelling of 615240161 in words is "six hundred fifteen million, two hundred forty thousand, one hundred sixty-one".