61329 has 4 divisors (see below), whose sum is σ = 81776. Its totient is φ = 40884.

The previous prime is 61297. The next prime is 61331. The reversal of 61329 is 92316.

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 61329 - 2⁵ = 61297 is a prime.

It is a super-2 number, since 2×61329² = 7522492482, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

61329 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (61339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10219 + ... + 10224.

It is an arithmetic number, because the mean of its divisors is an integer number (20444).

2⁶¹³²⁹ is an apocalyptic number.

It is an amenable number.

61329 is a deficient number, since it is larger than the sum of its proper divisors (20447).

61329 is a wasteful number, since it uses less digits than its factorization.

61329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20446.

The product of its digits is 324, while the sum is 21.

The square root of 61329 is about 247.6469260863. The cubic root of 61329 is about 39.4356158836.

The spelling of 61329 in words is "sixty-one thousand, three hundred twenty-nine".