61145 has 8 divisors (see below), whose sum is σ = 83904. Its totient is φ = 41904.

The previous prime is 61141. The next prime is 61151. The reversal of 61145 is 54116.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61145 - 2² = 61141 is a prime.

It is a super-2 number, since 2×61145² = 7477422050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (61141) 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 7 ways as a sum of consecutive naturals, for example, 839 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (10488).

2⁶¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

61145 is a deficient number, since it is larger than the sum of its proper divisors (22759).

61145 is a wasteful number, since it uses less digits than its factorization.

61145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its digits is 120, while the sum is 17.

The square root of 61145 is about 247.2751503892. The cubic root of 61145 is about 39.3961379742.

It can be divided in two parts, 611 and 45, that multiplied together give a triangular number (27495 = T₂₃₄).

The spelling of 61145 in words is "sixty-one thousand, one hundred forty-five".