161513797 has 4 divisors (see below), whose sum is σ = 168536160. Its totient is φ = 154491436.

The previous prime is 161513783. The next prime is 161513819. The reversal of 161513797 is 797315161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797315161 = 71 ⋅11229791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161513797 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 (161513717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511147 + ... + 3511192.

It is an arithmetic number, because the mean of its divisors is an integer number (42134040).

Almost surely, 2^161513797 is an apocalyptic number.

It is an amenable number.

161513797 is a deficient number, since it is larger than the sum of its proper divisors (7022363).

161513797 is an equidigital number, since it uses as much as digits as its factorization.

161513797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022362.

The product of its digits is 39690, while the sum is 40.

The square root of 161513797 is about 12708.8078512503. The cubic root of 161513797 is about 544.5902674677.

The spelling of 161513797 in words is "one hundred sixty-one million, five hundred thirteen thousand, seven hundred ninety-seven".