78451697 has 2 divisors, whose sum is σ = 78451698. Its totient is φ = 78451696.

The previous prime is 78451691. The next prime is 78451717. The reversal of 78451697 is 79615487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67634176 + 10817521 = 8224^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 78451697 - 2¹² = 78447601 is a prime.

It is not a weakly prime, because it can be changed into another prime (78451691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39225848 + 39225849.

It is an arithmetic number, because the mean of its divisors is an integer number (39225849).

Almost surely, 2^78451697 is an apocalyptic number.

It is an amenable number.

78451697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78451697 is an equidigital number, since it uses as much as digits as its factorization.

78451697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 78451697 is about 8857.2962578882. The cubic root of 78451697 is about 428.0890449283.

The spelling of 78451697 in words is "seventy-eight million, four hundred fifty-one thousand, six hundred ninety-seven".