55642973 has 2 divisors, whose sum is σ = 55642974. Its totient is φ = 55642972.

The previous prime is 55642943. The next prime is 55642997. The reversal of 55642973 is 37924655.

55642973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52157284 + 3485689 = 7222^2 + 1867^2 .

It is a cyclic number.

It is not a de Polignac number, because 55642973 - 2¹⁴ = 55626589 is a prime.

It is a super-2 number, since 2×55642973² = 6192280888557458, which contains 22 as substring.

It is a Sophie Germain prime.

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 55642973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55642943) 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 as a sum of consecutive naturals, namely, 27821486 + 27821487.

It is an arithmetic number, because the mean of its divisors is an integer number (27821487).

Almost surely, 2^55642973 is an apocalyptic number.

It is an amenable number.

55642973 is a deficient number, since it is larger than the sum of its proper divisors (1).

55642973 is an equidigital number, since it uses as much as digits as its factorization.

55642973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 55642973 is about 7459.4217604316. The cubic root of 55642973 is about 381.7714452913.

The spelling of 55642973 in words is "fifty-five million, six hundred forty-two thousand, nine hundred seventy-three".