86778971 has 2 divisors, whose sum is σ = 86778972. Its totient is φ = 86778970.

The previous prime is 86778961. The next prime is 86778997. The reversal of 86778971 is 17987768.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86778971 - 2¹⁴ = 86762587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86778961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43389485 + 43389486.

It is an arithmetic number, because the mean of its divisors is an integer number (43389486).

Almost surely, 2^86778971 is an apocalyptic number.

86778971 is a deficient number, since it is larger than the sum of its proper divisors (1).

86778971 is an equidigital number, since it uses as much as digits as its factorization.

86778971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 53.

The square root of 86778971 is about 9315.5231200400. The cubic root of 86778971 is about 442.7291987218.

The spelling of 86778971 in words is "eighty-six million, seven hundred seventy-eight thousand, nine hundred seventy-one".