81214751 has 2 divisors, whose sum is σ = 81214752. Its totient is φ = 81214750.

The previous prime is 81214733. The next prime is 81214769. The reversal of 81214751 is 15741218.

It is a balanced prime because it is at equal distance from previous prime (81214733) and next prime (81214769).

It is a cyclic number.

It is not a de Polignac number, because 81214751 - 2¹⁴ = 81198367 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81214711) 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, 40607375 + 40607376.

It is an arithmetic number, because the mean of its divisors is an integer number (40607376).

Almost surely, 2^81214751 is an apocalyptic number.

81214751 is a deficient number, since it is larger than the sum of its proper divisors (1).

81214751 is an equidigital number, since it uses as much as digits as its factorization.

81214751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

The square root of 81214751 is about 9011.9227138275. The cubic root of 81214751 is about 433.0569096369.

Adding to 81214751 its reverse (15741218), we get a palindrome (96955969).

The spelling of 81214751 in words is "eighty-one million, two hundred fourteen thousand, seven hundred fifty-one".