78961271 has 2 divisors, whose sum is σ = 78961272. Its totient is φ = 78961270.

The previous prime is 78961249. The next prime is 78961273. The reversal of 78961271 is 17216987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78961271 - 2¹⁰ = 78960247 is a prime.

Together with 78961273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78961273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480635 + 39480636.

It is an arithmetic number, because the mean of its divisors is an integer number (39480636).

Almost surely, 2^78961271 is an apocalyptic number.

78961271 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961271 is an equidigital number, since it uses as much as digits as its factorization.

78961271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 78961271 is about 8886.0154737655. The cubic root of 78961271 is about 429.0139131151.

The spelling of 78961271 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred seventy-one".