55249913 has 2 divisors, whose sum is σ = 55249914. Its totient is φ = 55249912.

The previous prime is 55249897. The next prime is 55249927. The reversal of 55249913 is 31994255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52301824 + 2948089 = 7232^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 55249913 - 2⁴ = 55249897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_3296279 and since 55249913 and 3296279 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 (55249213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27624956 + 27624957.

It is an arithmetic number, because the mean of its divisors is an integer number (27624957).

Almost surely, 2^55249913 is an apocalyptic number.

It is an amenable number.

55249913 is a deficient number, since it is larger than the sum of its proper divisors (1).

55249913 is an equidigital number, since it uses as much as digits as its factorization.

55249913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 55249913 is about 7433.0285214036. The cubic root of 55249913 is about 380.8703802406.

The spelling of 55249913 in words is "fifty-five million, two hundred forty-nine thousand, nine hundred thirteen".