61321 has 8 divisors (see below), whose sum is σ = 68040. Its totient is φ = 54912.

The previous prime is 61297. The next prime is 61331. The reversal of 61321 is 12316.

It can be written as a sum of positive squares in 4 ways, for example, as 1296 + 60025 = 36^2 + 245^2 .

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

It is not a de Polignac number, because 61321 - 2¹¹ = 59273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645 + ... + 733.

It is an arithmetic number, because the mean of its divisors is an integer number (8505).

2⁶¹³²¹ is an apocalyptic number.

It is an amenable number.

61321 is a deficient number, since it is larger than the sum of its proper divisors (6719).

61321 is a wasteful number, since it uses less digits than its factorization.

61321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155.

The product of its digits is 36, while the sum is 13.

The square root of 61321 is about 247.6307735319. The cubic root of 61321 is about 39.4339010959.

Adding to 61321 its reverse (12316), we get a palindrome (73637).

The spelling of 61321 in words is "sixty-one thousand, three hundred twenty-one".