55106981 has 2 divisors, whose sum is σ = 55106982. Its totient is φ = 55106980.

The previous prime is 55106959. The next prime is 55106999. The reversal of 55106981 is 18960155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29604481 + 25502500 = 5441^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 55106981 - 2¹⁸ = 54844837 is a prime.

It is a super-2 number, since 2×55106981² = 6073558709868722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55106581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27553490 + 27553491.

It is an arithmetic number, because the mean of its divisors is an integer number (27553491).

Almost surely, 2^55106981 is an apocalyptic number.

It is an amenable number.

55106981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55106981 is an equidigital number, since it uses as much as digits as its factorization.

55106981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 55106981 is about 7423.4076406998. The cubic root of 55106981 is about 380.5416582924.

The spelling of 55106981 in words is "fifty-five million, one hundred six thousand, nine hundred eighty-one".