61911 has 8 divisors (see below), whose sum is σ = 91760.
Its totient is φ = 41256.
The previous prime is 61909. The next prime is 61927. The reversal of 61911 is 11916.
It can be divided in two parts, 619 and 11, that added together give a triangular number (630 = T35).
It is not a de Polignac number, because 61911 - 21 = 61909 is a prime.
It is a Duffinian number.
61911 is a lucky number.
It is a plaindrome in base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (61961) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120 + ... + 1173.
It is an arithmetic number, because the mean of its divisors is an integer number (11470).
261911 is an apocalyptic number.
61911 is a deficient number, since it is larger than the sum of its proper divisors (29849).
61911 is a wasteful number, since it uses less digits than its factorization.
61911 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2302 (or 2296 counting only the distinct ones).
The product of its digits is 54, while the sum is 18.
The square root of 61911 is about 248.8192114769.
The cubic root of 61911 is about 39.5599687291.
The spelling of 61911 in words is "sixty-one thousand, nine hundred eleven".