55421923 has 2 divisors, whose sum is σ = 55421924. Its totient is φ = 55421922.

The previous prime is 55421909. The next prime is 55421953. The reversal of 55421923 is 32912455.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55421923 is a prime.

It is equal to p_3305893 and since 55421923 and 3305893 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55421903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710961 + 27710962.

It is an arithmetic number, because the mean of its divisors is an integer number (27710962).

Almost surely, 2^55421923 is an apocalyptic number.

55421923 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421923 is an equidigital number, since it uses as much as digits as its factorization.

55421923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 55421923 is about 7444.5901834822. The cubic root of 55421923 is about 381.2652263739.

The spelling of 55421923 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred twenty-three".