78913229 has 2 divisors, whose sum is σ = 78913230. Its totient is φ = 78913228.

The previous prime is 78913223. The next prime is 78913243. The reversal of 78913229 is 92231987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75655204 + 3258025 = 8698^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 78913229 - 2²⁴ = 62136013 is a prime.

It is a super-2 number, since 2×78913229² = 12454595422412882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78913223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39456614 + 39456615.

It is an arithmetic number, because the mean of its divisors is an integer number (39456615).

Almost surely, 2^78913229 is an apocalyptic number.

It is an amenable number.

78913229 is a deficient number, since it is larger than the sum of its proper divisors (1).

78913229 is an equidigital number, since it uses as much as digits as its factorization.

78913229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 78913229 is about 8883.3118261153. The cubic root of 78913229 is about 428.9268878871.

The spelling of 78913229 in words is "seventy-eight million, nine hundred thirteen thousand, two hundred twenty-nine".