55380981 has 8 divisors (see below), whose sum is σ = 76387680. Its totient is φ = 35647472.

The previous prime is 55380979. The next prime is 55381009. The reversal of 55380981 is 18908355.

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 55380981 - 2¹ = 55380979 is a prime.

It is a super-2 number, since 2×55380981² = 6134106113044722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55380901) 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, 318195 + ... + 318368.

It is an arithmetic number, because the mean of its divisors is an integer number (9548460).

Almost surely, 2^55380981 is an apocalyptic number.

It is an amenable number.

55380981 is a deficient number, since it is larger than the sum of its proper divisors (21006699).

55380981 is a wasteful number, since it uses less digits than its factorization.

55380981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636595.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 55380981 is about 7441.8398934672. The cubic root of 55380981 is about 381.1713188523.

The spelling of 55380981 in words is "fifty-five million, three hundred eighty thousand, nine hundred eighty-one".