61116981 has 8 divisors (see below), whose sum is σ = 81525504. Its totient is φ = 40726560.

The previous prime is 61116973. The next prime is 61117031. The reversal of 61116981 is 18961116.

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

It is not a de Polignac number, because 61116981 - 2³ = 61116973 is a prime.

It is a super-2 number, since 2×61116981² = 7470570733108722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61116971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10236 + ... + 15066.

It is an arithmetic number, because the mean of its divisors is an integer number (10190688).

Almost surely, 2^61116981 is an apocalyptic number.

It is an amenable number.

61116981 is a deficient number, since it is larger than the sum of its proper divisors (20408523).

61116981 is a wasteful number, since it uses less digits than its factorization.

61116981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9051.

The product of its digits is 2592, while the sum is 33.

The square root of 61116981 is about 7817.7350300455. The cubic root of 61116981 is about 393.9011944430.

The spelling of 61116981 in words is "sixty-one million, one hundred sixteen thousand, nine hundred eighty-one".