61824981 has 8 divisors (see below), whose sum is σ = 82865664. Its totient is φ = 41000480.

The previous prime is 61824953. The next prime is 61824991. The reversal of 61824981 is 18942816.

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 61824981 - 2¹¹ = 61822933 is a prime.

It is a super-2 number, since 2×61824981² = 7644656551300722, which 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 (61824901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53376 + ... + 54521.

It is an arithmetic number, because the mean of its divisors is an integer number (10358208).

Almost surely, 2^61824981 is an apocalyptic number.

It is an amenable number.

61824981 is a deficient number, since it is larger than the sum of its proper divisors (21040683).

61824981 is a wasteful number, since it uses less digits than its factorization.

61824981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108091.

The product of its digits is 27648, while the sum is 39.

The square root of 61824981 is about 7862.8863021158. The cubic root of 61824981 is about 395.4163872765.

The spelling of 61824981 in words is "sixty-one million, eight hundred twenty-four thousand, nine hundred eighty-one".