161964469 has 2 divisors, whose sum is σ = 161964470. Its totient is φ = 161964468.

The previous prime is 161964431. The next prime is 161964479. The reversal of 161964469 is 964469161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160351569 + 1612900 = 12663^2 + 1270^2 .

It is an emirp because it is prime and its reverse (964469161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161964469 - 2²¹ = 159867317 is a prime.

It is a super-2 number, since 2×161964469² = 52464978436903922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161964479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80982234 + 80982235.

It is an arithmetic number, because the mean of its divisors is an integer number (80982235).

Almost surely, 2^161964469 is an apocalyptic number.

It is an amenable number.

161964469 is a deficient number, since it is larger than the sum of its proper divisors (1).

161964469 is an equidigital number, since it uses as much as digits as its factorization.

161964469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 46.

The square root of 161964469 is about 12726.5261953135. The cubic root of 161964469 is about 545.0963205456.

The spelling of 161964469 in words is "one hundred sixty-one million, nine hundred sixty-four thousand, four hundred sixty-nine".