55321817 has 2 divisors, whose sum is σ = 55321818. Its totient is φ = 55321816.

The previous prime is 55321793. The next prime is 55321823. The reversal of 55321817 is 71812355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 24641296 = 5539^2 + 4964^2 .

It is a cyclic number.

It is not a de Polignac number, because 55321817 - 2⁶ = 55321753 is a prime.

It is not a weakly prime, because it can be changed into another prime (55321837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27660908 + 27660909.

It is an arithmetic number, because the mean of its divisors is an integer number (27660909).

Almost surely, 2^55321817 is an apocalyptic number.

It is an amenable number.

55321817 is a deficient number, since it is larger than the sum of its proper divisors (1).

55321817 is an equidigital number, since it uses as much as digits as its factorization.

55321817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 55321817 is about 7437.8637390046. The cubic root of 55321817 is about 381.0355342383.

The spelling of 55321817 in words is "fifty-five million, three hundred twenty-one thousand, eight hundred seventeen".