78311 has 2 divisors, whose sum is σ = 78312. Its totient is φ = 78310.

The previous prime is 78307. The next prime is 78317. The reversal of 78311 is 11387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78311 - 2² = 78307 is a prime.

It is a super-2 number, since 2×78311² = 12265225442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39155 + 39156.

It is an arithmetic number, because the mean of its divisors is an integer number (39156).

2⁷⁸³¹¹ is an apocalyptic number.

78311 is a deficient number, since it is larger than the sum of its proper divisors (1).

78311 is an equidigital number, since it uses as much as digits as its factorization.

78311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 78311 is about 279.8410262989. The cubic root of 78311 is about 42.7832977016.

Adding to 78311 its reverse (11387), we get a palindrome (89698).

The spelling of 78311 in words is "seventy-eight thousand, three hundred eleven".