61510161 has 4 divisors (see below), whose sum is σ = 82013552. Its totient is φ = 41006772.

The previous prime is 61510159. The next prime is 61510187. The reversal of 61510161 is 16101516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61510161 - 2¹ = 61510159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61510121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10251691 + ... + 10251696.

It is an arithmetic number, because the mean of its divisors is an integer number (20503388).

Almost surely, 2^61510161 is an apocalyptic number.

It is an amenable number.

61510161 is a deficient number, since it is larger than the sum of its proper divisors (20503391).

61510161 is a wasteful number, since it uses less digits than its factorization.

61510161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20503390.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 61510161 is about 7842.8413856204. The cubic root of 61510161 is about 394.7440760620.

Adding to 61510161 its reverse (16101516), we get a palindrome (77611677).

The spelling of 61510161 in words is "sixty-one million, five hundred ten thousand, one hundred sixty-one".