61022161 has 4 divisors (see below), whose sum is σ = 61338532. Its totient is φ = 60705792.

The previous prime is 61022153. The next prime is 61022173. The reversal of 61022161 is 16122016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10042561 + 50979600 = 3169^2 + 7140^2 .

It is a cyclic number.

It is not a de Polignac number, because 61022161 - 2³ = 61022153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61022131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157896 + ... + 158281.

It is an arithmetic number, because the mean of its divisors is an integer number (15334633).

Almost surely, 2^61022161 is an apocalyptic number.

It is an amenable number.

61022161 is a deficient number, since it is larger than the sum of its proper divisors (316371).

61022161 is a wasteful number, since it uses less digits than its factorization.

61022161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316370.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 61022161 is about 7811.6682597253. The cubic root of 61022161 is about 393.6973828741.

Adding to 61022161 its reverse (16122016), we get a palindrome (77144177).

The spelling of 61022161 in words is "sixty-one million, twenty-two thousand, one hundred sixty-one".