161140597 has 4 divisors (see below), whose sum is σ = 161232460. Its totient is φ = 161048736.

The previous prime is 161140583. The next prime is 161140601. The reversal of 161140597 is 795041161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95433361 + 65707236 = 9769^2 + 8106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161140597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161140547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43248 + ... + 46825.

It is an arithmetic number, because the mean of its divisors is an integer number (40308115).

Almost surely, 2^161140597 is an apocalyptic number.

It is an amenable number.

161140597 is a deficient number, since it is larger than the sum of its proper divisors (91863).

161140597 is an equidigital number, since it uses as much as digits as its factorization.

161140597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91862.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 161140597 is about 12694.1166293681. The cubic root of 161140597 is about 544.1704935707.

The spelling of 161140597 in words is "one hundred sixty-one million, one hundred forty thousand, five hundred ninety-seven".