61611 has 8 divisors (see below), whose sum is σ = 89664. Its totient is φ = 37320.

The previous prime is 61609. The next prime is 61613. The reversal of 61611 is 11616.

It is an interprime number because it is at equal distance from previous prime (61609) and next prime (61613).

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

It is not a de Polignac number, because 61611 - 2¹ = 61609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61613) 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, 901 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (11208).

2⁶¹⁶¹¹ is an apocalyptic number.

61611 is a deficient number, since it is larger than the sum of its proper divisors (28053).

61611 is a wasteful number, since it uses less digits than its factorization.

61611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 36, while the sum is 15.

The square root of 61611 is about 248.2156320621. The cubic root of 61611 is about 39.4959671148.

It can be divided in two parts, 616 and 11, that multiplied together give a palindrome (6776).

The spelling of 61611 in words is "sixty-one thousand, six hundred eleven".