161296777 has 2 divisors, whose sum is σ = 161296778. Its totient is φ = 161296776.

The previous prime is 161296739. The next prime is 161296781. The reversal of 161296777 is 777692161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149352841 + 11943936 = 12221^2 + 3456^2 .

It is a cyclic number.

It is not a de Polignac number, because 161296777 - 2¹⁵ = 161264009 is a prime.

It is not a weakly prime, because it can be changed into another prime (161296717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80648388 + 80648389.

It is an arithmetic number, because the mean of its divisors is an integer number (80648389).

Almost surely, 2^161296777 is an apocalyptic number.

It is an amenable number.

161296777 is a deficient number, since it is larger than the sum of its proper divisors (1).

161296777 is an equidigital number, since it uses as much as digits as its factorization.

161296777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 46.

The square root of 161296777 is about 12700.2668082210. The cubic root of 161296777 is about 544.3462430024.

It can be divided in two parts, 1612 and 96777, that added together give a palindrome (98389).

The spelling of 161296777 in words is "one hundred sixty-one million, two hundred ninety-six thousand, seven hundred seventy-seven".