78233161 has 2 divisors, whose sum is σ = 78233162. Its totient is φ = 78233160.

The previous prime is 78233159. The next prime is 78233173. The reversal of 78233161 is 16133287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71571600 + 6661561 = 8460^2 + 2581^2 .

It is an emirp because it is prime and its reverse (16133287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78233161 - 2¹ = 78233159 is a prime.

It is a super-2 number, since 2×78233161² = 12240854960103842, which contains 22 as substring.

Together with 78233159, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78233191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39116580 + 39116581.

It is an arithmetic number, because the mean of its divisors is an integer number (39116581).

Almost surely, 2^78233161 is an apocalyptic number.

It is an amenable number.

78233161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78233161 is an equidigital number, since it uses as much as digits as its factorization.

78233161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 78233161 is about 8844.9511587120. The cubic root of 78233161 is about 427.6911785846.

The spelling of 78233161 in words is "seventy-eight million, two hundred thirty-three thousand, one hundred sixty-one".