61993 has 4 divisors (see below), whose sum is σ = 63360. Its totient is φ = 60628.

The previous prime is 61991. The next prime is 62003. The reversal of 61993 is 39916.

It is a happy number.

61993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61993 - 2¹ = 61991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61991) 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, 613 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (15840).

2⁶¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

61993 is a deficient number, since it is larger than the sum of its proper divisors (1367).

61993 is a wasteful number, since it uses less digits than its factorization.

61993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

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

The square root of 61993 is about 248.9839352247. The cubic root of 61993 is about 39.5774265116.

The spelling of 61993 in words is "sixty-one thousand, nine hundred ninety-three".