78180211 has 2 divisors, whose sum is σ = 78180212. Its totient is φ = 78180210.

The previous prime is 78180209. The next prime is 78180241. The reversal of 78180211 is 11208187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78180211 - 2¹ = 78180209 is a prime.

It is a super-2 number, since 2×78180211² = 12224290784009042, which contains 22 as substring.

Together with 78180209, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78180211.

It is not a weakly prime, because it can be changed into another prime (78180241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39090105 + 39090106.

It is an arithmetic number, because the mean of its divisors is an integer number (39090106).

Almost surely, 2^78180211 is an apocalyptic number.

78180211 is a deficient number, since it is larger than the sum of its proper divisors (1).

78180211 is an equidigital number, since it uses as much as digits as its factorization.

78180211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 78180211 is about 8841.9574190334. The cubic root of 78180211 is about 427.5946664035.

Adding to 78180211 its reverse (11208187), we get a palindrome (89388398).

The spelling of 78180211 in words is "seventy-eight million, one hundred eighty thousand, two hundred eleven".