78972071 has 2 divisors, whose sum is σ = 78972072. Its totient is φ = 78972070.

The previous prime is 78972059. The next prime is 78972083. The reversal of 78972071 is 17027987.

It is a balanced prime because it is at equal distance from previous prime (78972059) and next prime (78972083).

It is an emirp because it is prime and its reverse (17027987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78972071 - 2¹⁸ = 78709927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78972011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39486035 + 39486036.

It is an arithmetic number, because the mean of its divisors is an integer number (39486036).

Almost surely, 2^78972071 is an apocalyptic number.

78972071 is a deficient number, since it is larger than the sum of its proper divisors (1).

78972071 is an equidigital number, since it uses as much as digits as its factorization.

78972071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 78972071 is about 8886.6231494308. The cubic root of 78972071 is about 429.0334718134.

The spelling of 78972071 in words is "seventy-eight million, nine hundred seventy-two thousand, seventy-one".