55275981 has 4 divisors (see below), whose sum is σ = 73701312. Its totient is φ = 36850652.

The previous prime is 55275967. The next prime is 55276019. The reversal of 55275981 is 18957255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55275981 - 2⁵ = 55275949 is a prime.

It is a super-2 number, since 2×55275981² = 6110868151024722, 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 (55275911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9212661 + ... + 9212666.

It is an arithmetic number, because the mean of its divisors is an integer number (18425328).

Almost surely, 2^55275981 is an apocalyptic number.

It is an amenable number.

55275981 is a deficient number, since it is larger than the sum of its proper divisors (18425331).

55275981 is a wasteful number, since it uses less digits than its factorization.

55275981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18425330.

The product of its digits is 126000, while the sum is 42.

The square root of 55275981 is about 7434.7818394355. The cubic root of 55275981 is about 380.9302715445.

The spelling of 55275981 in words is "fifty-five million, two hundred seventy-five thousand, nine hundred eighty-one".