78135271 has 2 divisors, whose sum is σ = 78135272. Its totient is φ = 78135270.

The previous prime is 78135259. The next prime is 78135341. The reversal of 78135271 is 17253187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78135271 - 2⁷ = 78135143 is a prime.

It is a super-2 number, since 2×78135271² = 12210241148486882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78135241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067635 + 39067636.

It is an arithmetic number, because the mean of its divisors is an integer number (39067636).

Almost surely, 2^78135271 is an apocalyptic number.

78135271 is a deficient number, since it is larger than the sum of its proper divisors (1).

78135271 is an equidigital number, since it uses as much as digits as its factorization.

78135271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 78135271 is about 8839.4157612367. The cubic root of 78135271 is about 427.5127198887.

The spelling of 78135271 in words is "seventy-eight million, one hundred thirty-five thousand, two hundred seventy-one".