55561313 has 2 divisors, whose sum is σ = 55561314. Its totient is φ = 55561312.

The previous prime is 55561283. The next prime is 55561349. The reversal of 55561313 is 31316555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 4695889 = 7132^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 55561313 - 2¹² = 55557217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55561213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780656 + 27780657.

It is an arithmetic number, because the mean of its divisors is an integer number (27780657).

Almost surely, 2^55561313 is an apocalyptic number.

It is an amenable number.

55561313 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561313 is an equidigital number, since it uses as much as digits as its factorization.

55561313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 29.

The square root of 55561313 is about 7453.9461361080. The cubic root of 55561313 is about 381.5845949864.

Adding to 55561313 its reverse (31316555), we get a palindrome (86877868).

The spelling of 55561313 in words is "fifty-five million, five hundred sixty-one thousand, three hundred thirteen".