78231287 has 2 divisors, whose sum is σ = 78231288. Its totient is φ = 78231286.

The previous prime is 78231269. The next prime is 78231323. The reversal of 78231287 is 78213287.

It is a weak prime.

It is an emirp because it is prime and its reverse (78213287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78231287 is a prime.

It is a super-2 number, since 2×78231287² = 12240268531352738, which contains 22 as substring.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 78231287 parts by 12508 straight cuts.

It is equal to p_4572299 and since 78231287 and 4572299 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 78231287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78231217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39115643 + 39115644.

It is an arithmetic number, because the mean of its divisors is an integer number (39115644).

Almost surely, 2^78231287 is an apocalyptic number.

78231287 is a deficient number, since it is larger than the sum of its proper divisors (1).

78231287 is an equidigital number, since it uses as much as digits as its factorization.

78231287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 78231287 is about 8844.8452219358. The cubic root of 78231287 is about 427.6877635806.

The spelling of 78231287 in words is "seventy-eight million, two hundred thirty-one thousand, two hundred eighty-seven".