61231116981 has 8 divisors (see below), whose sum is σ = 83378542464. Its totient is φ = 39952218080.

The previous prime is 61231116979. The next prime is 61231117019. The reversal of 61231116981 is 18961113216.

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

It is a cyclic number.

It is not a de Polignac number, because 61231116981 - 2¹ = 61231116979 is a prime.

It is a super-2 number, since 2×61231116981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61231116481) 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 7 ways as a sum of consecutive naturals, for example, 217131480 + ... + 217131761.

It is an arithmetic number, because the mean of its divisors is an integer number (10422317808).

Almost surely, 2^61231116981 is an apocalyptic number.

It is an amenable number.

61231116981 is a deficient number, since it is larger than the sum of its proper divisors (22147425483).

61231116981 is a wasteful number, since it uses less digits than its factorization.

61231116981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434263291.

The product of its digits is 15552, while the sum is 39.

The spelling of 61231116981 in words is "sixty-one billion, two hundred thirty-one million, one hundred sixteen thousand, nine hundred eighty-one".