61939 has 4 divisors (see below), whose sum is σ = 64656. Its totient is φ = 59224.

The previous prime is 61933. The next prime is 61949. The reversal of 61939 is 93916.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61939 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (61933) 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 3 ways as a sum of consecutive naturals, for example, 1324 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (16164).

2⁶¹⁹³⁹ is an apocalyptic number.

61939 is a deficient number, since it is larger than the sum of its proper divisors (2717).

61939 is a wasteful number, since it uses less digits than its factorization.

61939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716.

The product of its digits is 1458, while the sum is 28.

The square root of 61939 is about 248.8754708685. The cubic root of 61939 is about 39.5659316554.

It can be divided in two parts, 61 and 939, that added together give a cube (1000 = 10³).

The spelling of 61939 in words is "sixty-one thousand, nine hundred thirty-nine".