78357161 has 4 divisors (see below), whose sum is σ = 79835652. Its totient is φ = 76878672.

The previous prime is 78357151. The next prime is 78357173. The reversal of 78357161 is 16175387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16175387 = 2039 ⋅7933.

It can be written as a sum of positive squares in 2 ways, for example, as 33131536 + 45225625 = 5756^2 + 6725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78357161 is a prime.

It is a super-2 number, since 2×78357161² = 12279689359959842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78357151) 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 3 ways as a sum of consecutive naturals, for example, 739166 + ... + 739271.

It is an arithmetic number, because the mean of its divisors is an integer number (19958913).

Almost surely, 2^78357161 is an apocalyptic number.

It is an amenable number.

78357161 is a deficient number, since it is larger than the sum of its proper divisors (1478491).

78357161 is a wasteful number, since it uses less digits than its factorization.

78357161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478490.

The product of its digits is 35280, while the sum is 38.

The square root of 78357161 is about 8851.9580319837. The cubic root of 78357161 is about 427.9170236122.

The spelling of 78357161 in words is "seventy-eight million, three hundred fifty-seven thousand, one hundred sixty-one".