161770597 has 8 divisors (see below), whose sum is σ = 164668280. Its totient is φ = 158880960.

The previous prime is 161770577. The next prime is 161770621. The reversal of 161770597 is 795077161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19660356 + 142110241 = 4434^2 + 11921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161770597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161770517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50479 + ... + 53587.

It is an arithmetic number, because the mean of its divisors is an integer number (20583535).

Almost surely, 2^161770597 is an apocalyptic number.

It is an amenable number.

161770597 is a deficient number, since it is larger than the sum of its proper divisors (2897683).

161770597 is an equidigital number, since it uses as much as digits as its factorization.

161770597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023.

The product of its (nonzero) digits is 92610, while the sum is 43.

The square root of 161770597 is about 12718.9070678262. The cubic root of 161770597 is about 544.8787396803.

The spelling of 161770597 in words is "one hundred sixty-one million, seven hundred seventy thousand, five hundred ninety-seven".