61993311 has 4 divisors (see below), whose sum is σ = 82657752. Its totient is φ = 41328872.

The previous prime is 61993297. The next prime is 61993313. The reversal of 61993311 is 11339916.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61993311 - 2²¹ = 59896159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61993313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10332216 + ... + 10332221.

It is an arithmetic number, because the mean of its divisors is an integer number (20664438).

Almost surely, 2^61993311 is an apocalyptic number.

61993311 is a deficient number, since it is larger than the sum of its proper divisors (20664441).

61993311 is a wasteful number, since it uses less digits than its factorization.

61993311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20664440.

The product of its digits is 4374, while the sum is 33.

The square root of 61993311 is about 7873.5831106301. The cubic root of 61993311 is about 395.7749269416.

The spelling of 61993311 in words is "sixty-one million, nine hundred ninety-three thousand, three hundred eleven".