146561 has 4 divisors (see below), whose sum is σ = 147972. Its totient is φ = 145152.

The previous prime is 146543. The next prime is 146563. The reversal of 146561 is 165641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165641 = 7 ⋅23663.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 67600 = 281^2 + 260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (146563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536 + ... + 761.

It is an arithmetic number, because the mean of its divisors is an integer number (36993).

2¹⁴⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

146561 is a deficient number, since it is larger than the sum of its proper divisors (1411).

146561 is a wasteful number, since it uses less digits than its factorization.

146561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its digits is 720, while the sum is 23.

The square root of 146561 is about 382.8328617034. The cubic root of 146561 is about 52.7237315209.

It can be divided in two parts, 146 and 561, that added together give a palindrome (707).

The spelling of 146561 in words is "one hundred forty-six thousand, five hundred sixty-one".