161620769 has 2 divisors, whose sum is σ = 161620770. Its totient is φ = 161620768.

The previous prime is 161620757. The next prime is 161620777. The reversal of 161620769 is 967026161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161620369 + 400 = 12713^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161620769 is a prime.

It is a super-2 number, since 2×161620769² = 52242545944302722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (160620769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80810384 + 80810385.

It is an arithmetic number, because the mean of its divisors is an integer number (80810385).

Almost surely, 2^161620769 is an apocalyptic number.

It is an amenable number.

161620769 is a deficient number, since it is larger than the sum of its proper divisors (1).

161620769 is an equidigital number, since it uses as much as digits as its factorization.

161620769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 161620769 is about 12713.0157319182. The cubic root of 161620769 is about 544.7104698999.

The spelling of 161620769 in words is "one hundred sixty-one million, six hundred twenty thousand, seven hundred sixty-nine".