55001681 has 8 divisors (see below), whose sum is σ = 66556800. Its totient is φ = 44371008.

The previous prime is 55001677. The next prime is 55001689. The reversal of 55001681 is 18610055.

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 55001681 - 2² = 55001677 is a prime.

It is a super-2 number, since 2×55001681² = 6050369825651522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55001681.

It is not an unprimeable number, because it can be changed into a prime (55001689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230981 + ... + 231218.

It is an arithmetic number, because the mean of its divisors is an integer number (8319600).

Almost surely, 2^55001681 is an apocalyptic number.

It is an amenable number.

55001681 is a deficient number, since it is larger than the sum of its proper divisors (11555119).

55001681 is a wasteful number, since it uses less digits than its factorization.

55001681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462223.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 55001681 is about 7416.3118192266. The cubic root of 55001681 is about 380.2991204385.

The spelling of 55001681 in words is "fifty-five million, one thousand, six hundred eighty-one".