161930777 has 2 divisors, whose sum is σ = 161930778. Its totient is φ = 161930776.

The previous prime is 161930773. The next prime is 161930801. The reversal of 161930777 is 777039161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125798656 + 36132121 = 11216^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 161930777 - 2² = 161930773 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161930773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80965388 + 80965389.

It is an arithmetic number, because the mean of its divisors is an integer number (80965389).

Almost surely, 2^161930777 is an apocalyptic number.

It is an amenable number.

161930777 is a deficient number, since it is larger than the sum of its proper divisors (1).

161930777 is an equidigital number, since it uses as much as digits as its factorization.

161930777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55566, while the sum is 41.

The square root of 161930777 is about 12725.2024345391. The cubic root of 161930777 is about 545.0585207760.

The spelling of 161930777 in words is "one hundred sixty-one million, nine hundred thirty thousand, seven hundred seventy-seven".