78371297 has 2 divisors, whose sum is σ = 78371298. Its totient is φ = 78371296.

The previous prime is 78371273. The next prime is 78371329. The reversal of 78371297 is 79217387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61716736 + 16654561 = 7856^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 78371297 - 2²⁴ = 61594081 is a prime.

It is a super-2 number, since 2×78371297² = 12284120386924418, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78371197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39185648 + 39185649.

It is an arithmetic number, because the mean of its divisors is an integer number (39185649).

Almost surely, 2^78371297 is an apocalyptic number.

It is an amenable number.

78371297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78371297 is an equidigital number, since it uses as much as digits as its factorization.

78371297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 78371297 is about 8852.7564633847. The cubic root of 78371297 is about 427.9427548121.

The spelling of 78371297 in words is "seventy-eight million, three hundred seventy-one thousand, two hundred ninety-seven".