161570297 has 6 divisors (see below), whose sum is σ = 187949178. Its totient is φ = 138488784.

The previous prime is 161570293. The next prime is 161570317. The reversal of 161570297 is 792075161.

It can be written as a sum of positive squares in only one way, i.e., 94264681 + 67305616 = 9709^2 + 8204^2 .

It is not a de Polignac number, because 161570297 - 2² = 161570293 is a prime.

It is a super-2 number, since 2×161570297² = 52209921745336418, which contains 22 as substring.

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 161570297.

It is not an unprimeable number, because it can be changed into a prime (161570293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1648628 + ... + 1648725.

It is an arithmetic number, because the mean of its divisors is an integer number (31324863).

Almost surely, 2^161570297 is an apocalyptic number.

It is an amenable number.

161570297 is a deficient number, since it is larger than the sum of its proper divisors (26378881).

161570297 is an equidigital number, since it uses as much as digits as its factorization.

161570297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297367 (or 3297360 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 161570297 is about 12711.0305247057. The cubic root of 161570297 is about 544.6537620700.

The spelling of 161570297 in words is "one hundred sixty-one million, five hundred seventy thousand, two hundred ninety-seven".