55515223 has 2 divisors, whose sum is σ = 55515224. Its totient is φ = 55515222.

The previous prime is 55515197. The next prime is 55515233. The reversal of 55515223 is 32251555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55515223 - 2¹³ = 55507031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55515191 and 55515200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55515233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27757611 + 27757612.

It is an arithmetic number, because the mean of its divisors is an integer number (27757612).

Almost surely, 2^55515223 is an apocalyptic number.

55515223 is a deficient number, since it is larger than the sum of its proper divisors (1).

55515223 is an equidigital number, since it uses as much as digits as its factorization.

55515223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 28.

The square root of 55515223 is about 7450.8538436880. The cubic root of 55515223 is about 381.4790533284.

Adding to 55515223 its reverse (32251555), we get a palindrome (87766778).

The spelling of 55515223 in words is "fifty-five million, five hundred fifteen thousand, two hundred twenty-three".