61555 has 8 divisors (see below), whose sum is σ = 79632. Its totient is φ = 45408.

The previous prime is 61553. The next prime is 61559. The reversal of 61555 is 55516.

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

It is a cyclic number.

It is not a de Polignac number, because 61555 - 2¹ = 61553 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (61553) 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, 409 + ... + 538.

It is an arithmetic number, because the mean of its divisors is an integer number (9954).

2⁶¹⁵⁵⁵ is an apocalyptic number.

61555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61555 is a deficient number, since it is larger than the sum of its proper divisors (18077).

61555 is a wasteful number, since it uses less digits than its factorization.

61555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 750, while the sum is 22.

The square root of 61555 is about 248.1028012740. The cubic root of 61555 is about 39.4839971494.

It can be divided in two parts, 61 and 555, that added together give a palindrome (616).

The spelling of 61555 in words is "sixty-one thousand, five hundred fifty-five".