78163249 has 2 divisors, whose sum is σ = 78163250. Its totient is φ = 78163248.

The previous prime is 78163247. The next prime is 78163313. The reversal of 78163249 is 94236187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77316849 + 846400 = 8793^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 78163249 - 2¹ = 78163247 is a prime.

It is a super-2 number, since 2×78163249² = 12218986988472002, which contains 22 as substring.

Together with 78163247, 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 (78163243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081624 + 39081625.

It is an arithmetic number, because the mean of its divisors is an integer number (39081625).

Almost surely, 2^78163249 is an apocalyptic number.

It is an amenable number.

78163249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78163249 is an equidigital number, since it uses as much as digits as its factorization.

78163249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 78163249 is about 8840.9981902498. The cubic root of 78163249 is about 427.5637404815.

The spelling of 78163249 in words is "seventy-eight million, one hundred sixty-three thousand, two hundred forty-nine".