61345 has 4 divisors (see below), whose sum is σ = 73620. Its totient is φ = 49072.

The previous prime is 61343. The next prime is 61357. The reversal of 61345 is 54316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42849 + 18496 = 207^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 61345 - 2¹ = 61343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61343) 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, 6130 + ... + 6139.

It is an arithmetic number, because the mean of its divisors is an integer number (18405).

2⁶¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

61345 is a deficient number, since it is larger than the sum of its proper divisors (12275).

61345 is a wasteful number, since it uses less digits than its factorization.

61345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12274.

The product of its digits is 360, while the sum is 19.

The square root of 61345 is about 247.6792280350. The cubic root of 61345 is about 39.4390450117.

It can be divided in two parts, 61 and 345, that added together give a triangular number (406 = T₂₈).

The spelling of 61345 in words is "sixty-one thousand, three hundred forty-five".