61161 has 16 divisors (see below), whose sum is σ = 91200. Its totient is φ = 36288.

The previous prime is 61153. The next prime is 61169. The reversal of 61161 is 16116.

61161 = T₃₈ + T₃₉ + ... + T₇₄.

61161 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (61153) and next prime (61169).

It is not a de Polignac number, because 61161 - 2³ = 61153 is a prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 61161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61169) 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 15 ways as a sum of consecutive naturals, for example, 1635 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (5700).

2⁶¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

61161 is a deficient number, since it is larger than the sum of its proper divisors (30039).

61161 is a wasteful number, since it uses less digits than its factorization.

61161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88.

The product of its digits is 36, while the sum is 15.

The square root of 61161 is about 247.3075008972. The cubic root of 61161 is about 39.3995739774.

Adding to 61161 its reverse (16116), we get a palindrome (77277).

It can be divided in two parts, 61 and 161, that added together give a palindrome (222).

The spelling of 61161 in words is "sixty-one thousand, one hundred sixty-one".