61550161 has 2 divisors, whose sum is σ = 61550162. Its totient is φ = 61550160.

The previous prime is 61550147. The next prime is 61550179. The reversal of 61550161 is 16105516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 5973136 = 7455^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 61550161 - 2⁷ = 61550033 is a prime.

It is not a weakly prime, because it can be changed into another prime (61553161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775080 + 30775081.

It is an arithmetic number, because the mean of its divisors is an integer number (30775081).

Almost surely, 2^61550161 is an apocalyptic number.

It is an amenable number.

61550161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61550161 is an equidigital number, since it uses as much as digits as its factorization.

61550161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61550161 is about 7845.3910673720. The cubic root of 61550161 is about 394.8296247548.

Adding to 61550161 its reverse (16105516), we get a palindrome (77655677).

The spelling of 61550161 in words is "sixty-one million, five hundred fifty thousand, one hundred sixty-one".