161995297 has 12 divisors (see below), whose sum is σ = 166356180. Its totient is φ = 157740512.

The previous prime is 161995289. The next prime is 161995303. The reversal of 161995297 is 792599161.

161995297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 77281681 + 84713616 = 8791^2 + 9204^2 .

It is not a de Polignac number, because 161995297 - 2³ = 161995289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161995297.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161995277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 602079 + ... + 602347.

It is an arithmetic number, because the mean of its divisors is an integer number (13863015).

Almost surely, 2^161995297 is an apocalyptic number.

It is an amenable number.

161995297 is a deficient number, since it is larger than the sum of its proper divisors (4360883).

161995297 is an equidigital number, since it uses as much as digits as its factorization.

161995297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 501 counting only the distinct ones).

The product of its digits is 306180, while the sum is 49.

The square root of 161995297 is about 12727.7373087285. The cubic root of 161995297 is about 545.1309025405.

The spelling of 161995297 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, two hundred ninety-seven".