55216313 has 2 divisors, whose sum is σ = 55216314. Its totient is φ = 55216312.

The previous prime is 55216303. The next prime is 55216327. The reversal of 55216313 is 31361255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47224384 + 7991929 = 6872^2 + 2827^2 .

It is a cyclic number.

It is not a de Polignac number, because 55216313 - 2¹² = 55212217 is a prime.

It is not a weakly prime, because it can be changed into another prime (55216303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27608156 + 27608157.

It is an arithmetic number, because the mean of its divisors is an integer number (27608157).

Almost surely, 2^55216313 is an apocalyptic number.

It is an amenable number.

55216313 is a deficient number, since it is larger than the sum of its proper divisors (1).

55216313 is an equidigital number, since it uses as much as digits as its factorization.

55216313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 55216313 is about 7430.7679953017. The cubic root of 55216313 is about 380.7931563492.

Adding to 55216313 its reverse (31361255), we get a palindrome (86577568).

The spelling of 55216313 in words is "fifty-five million, two hundred sixteen thousand, three hundred thirteen".