861277735321 has 2 divisors, whose sum is σ = 861277735322. Its totient is φ = 861277735320.

The previous prime is 861277735313. The next prime is 861277735369. The reversal of 861277735321 is 123537772168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852889190400 + 8388544921 = 923520^2 + 91589^2 .

It is a cyclic number.

It is not a de Polignac number, because 861277735321 - 2³ = 861277735313 is a prime.

It is not a weakly prime, because it can be changed into another prime (861277735121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430638867660 + 430638867661.

It is an arithmetic number, because the mean of its divisors is an integer number (430638867661).

Almost surely, 2^861277735321 is an apocalyptic number.

It is an amenable number.

861277735321 is a deficient number, since it is larger than the sum of its proper divisors (1).

861277735321 is an equidigital number, since it uses as much as digits as its factorization.

861277735321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 52.

The spelling of 861277735321 in words is "eight hundred sixty-one billion, two hundred seventy-seven million, seven hundred thirty-five thousand, three hundred twenty-one".