78949697 has 2 divisors, whose sum is σ = 78949698. Its totient is φ = 78949696.

The previous prime is 78949691. The next prime is 78949699. The reversal of 78949697 is 79694987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65141041 + 13808656 = 8071^2 + 3716^2 .

It is a cyclic number.

It is not a de Polignac number, because 78949697 - 2⁸ = 78949441 is a prime.

Together with 78949699, 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 (78949691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39474848 + 39474849.

It is an arithmetic number, because the mean of its divisors is an integer number (39474849).

Almost surely, 2^78949697 is an apocalyptic number.

It is an amenable number.

78949697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78949697 is an equidigital number, since it uses as much as digits as its factorization.

78949697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 78949697 is about 8885.3642018772. The cubic root of 78949697 is about 428.9929507303.

The spelling of 78949697 in words is "seventy-eight million, nine hundred forty-nine thousand, six hundred ninety-seven".