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55615321 is a prime number
BaseRepresentation
bin1101010000100…
…1111101011001
310212122112212201
43110021331121
5103214142241
65304010201
71243502536
oct324117531
9125575781
1055615321
1129436683
1216760961
13b6a3298
147559d8d
154d38931
hex3509f59

55615321 has 2 divisors, whose sum is σ = 55615322. Its totient is φ = 55615320.

The previous prime is 55615319. The next prime is 55615367. The reversal of 55615321 is 12351655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 929296 = 7395^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 55615321 - 21 = 55615319 is a prime.

Together with 55615319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55615321.

It is not a weakly prime, because it can be changed into another prime (55613321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27807660 + 27807661.

It is an arithmetic number, because the mean of its divisors is an integer number (27807661).

Almost surely, 255615321 is an apocalyptic number.

It is an amenable number.

55615321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615321 is an equidigital number, since it uses as much as digits as its factorization.

55615321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 28.

The square root of 55615321 is about 7457.5680352244. The cubic root of 55615321 is about 381.7081938589.

Adding to 55615321 its reverse (12351655), we get a palindrome (67966976).

The spelling of 55615321 in words is "fifty-five million, six hundred fifteen thousand, three hundred twenty-one".