61117881 has 8 divisors (see below), whose sum is σ = 88898784. Its totient is φ = 37041120.

The previous prime is 61117879. The next prime is 61117891. The reversal of 61117881 is 18871116.

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

It is not a de Polignac number, because 61117881 - 2¹ = 61117879 is a prime.

It is a super-2 number, since 2×61117881² = 7470790755860322, 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 Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1852057 = 61117881 / (6 + 1 + 1 + 1 + 7 + 8 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (61117811) 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, 925996 + ... + 926061.

It is an arithmetic number, because the mean of its divisors is an integer number (11112348).

Almost surely, 2^61117881 is an apocalyptic number.

It is an amenable number.

61117881 is a deficient number, since it is larger than the sum of its proper divisors (27780903).

61117881 is a wasteful number, since it uses less digits than its factorization.

61117881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852071.

The product of its digits is 2688, while the sum is 33.

The square root of 61117881 is about 7817.7925912626. The cubic root of 61117881 is about 393.9031279445.

Adding to 61117881 its reverse (18871116), we get a palindrome (79988997).

The spelling of 61117881 in words is "sixty-one million, one hundred seventeen thousand, eight hundred eighty-one".