61549 has 4 divisors (see below), whose sum is σ = 62620. Its totient is φ = 60480.

The previous prime is 61547. The next prime is 61553. The reversal of 61549 is 94516.

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 8649 + 52900 = 93^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 61549 - 2¹ = 61547 is a prime.

It is an Ulam number.

It is a Duffinian number.

61549 is a modest number, since divided by 549 gives 61 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61543) 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, 444 + ... + 565.

It is an arithmetic number, because the mean of its divisors is an integer number (15655).

2⁶¹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

61549 is a deficient number, since it is larger than the sum of its proper divisors (1071).

61549 is a wasteful number, since it uses less digits than its factorization.

61549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070.

The product of its digits is 1080, while the sum is 25.

The square root of 61549 is about 248.0907092174. The cubic root of 61549 is about 39.4827142226.

It can be divided in two parts, 615 and 49, that multiplied together give a triangular number (30135 = T₂₄₅).

The spelling of 61549 in words is "sixty-one thousand, five hundred forty-nine".