78311201 has 2 divisors, whose sum is σ = 78311202. Its totient is φ = 78311200.

The previous prime is 78311171. The next prime is 78311221. The reversal of 78311201 is 10211387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78304801 + 6400 = 8849^2 + 80^2 .

It is an emirp because it is prime and its reverse (10211387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78311201 - 2¹⁴ = 78294817 is a prime.

It is a super-2 number, since 2×78311201² = 12265288404124802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78311221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39155600 + 39155601.

It is an arithmetic number, because the mean of its divisors is an integer number (39155601).

Almost surely, 2^78311201 is an apocalyptic number.

It is an amenable number.

78311201 is a deficient number, since it is larger than the sum of its proper divisors (1).

78311201 is an equidigital number, since it uses as much as digits as its factorization.

78311201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 78311201 is about 8849.3616153935. The cubic root of 78311201 is about 427.8333430542.

Adding to 78311201 its reverse (10211387), we get a palindrome (88522588).

The spelling of 78311201 in words is "seventy-eight million, three hundred eleven thousand, two hundred one".