61228144321 has 2 divisors, whose sum is σ = 61228144322. Its totient is φ = 61228144320.

The previous prime is 61228144297. The next prime is 61228144337. The reversal of 61228144321 is 12344182216.

61228144321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30988673296 + 30239471025 = 176036^2 + 173895^2 .

It is a cyclic number.

It is not a de Polignac number, because 61228144321 - 2²³ = 61219755713 is a prime.

It is not a weakly prime, because it can be changed into another prime (61228148321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30614072160 + 30614072161.

It is an arithmetic number, because the mean of its divisors is an integer number (30614072161).

Almost surely, 2^61228144321 is an apocalyptic number.

It is an amenable number.

61228144321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61228144321 is an equidigital number, since it uses as much as digits as its factorization.

61228144321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The spelling of 61228144321 in words is "sixty-one billion, two hundred twenty-eight million, one hundred forty-four thousand, three hundred twenty-one".