61953681 has 8 divisors (see below), whose sum is σ = 82643680. Its totient is φ = 41283072.

The previous prime is 61953667. The next prime is 61953691. The reversal of 61953681 is 18635916.

61953681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61953681 - 2⁹ = 61953169 is a prime.

It is a super-2 number, since 2×61953681² = 7676517178899522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61953611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6225 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (10330460).

Almost surely, 2^61953681 is an apocalyptic number.

It is an amenable number.

61953681 is a deficient number, since it is larger than the sum of its proper divisors (20689999).

61953681 is a wasteful number, since it uses less digits than its factorization.

61953681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9695.

The product of its digits is 38880, while the sum is 39.

The square root of 61953681 is about 7871.0660650258. The cubic root of 61953681 is about 395.6905742727.

The spelling of 61953681 in words is "sixty-one million, nine hundred fifty-three thousand, six hundred eighty-one".