81436051 has 2 divisors, whose sum is σ = 81436052. Its totient is φ = 81436050.

The previous prime is 81436013. The next prime is 81436079. The reversal of 81436051 is 15063418.

It is an a-pointer prime, because the next prime (81436079) can be obtained adding 81436051 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81436051 - 2⁷ = 81435923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81436081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40718025 + 40718026.

It is an arithmetic number, because the mean of its divisors is an integer number (40718026).

Almost surely, 2^81436051 is an apocalyptic number.

81436051 is a deficient number, since it is larger than the sum of its proper divisors (1).

81436051 is an equidigital number, since it uses as much as digits as its factorization.

81436051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81436051 is about 9024.1925400559. The cubic root of 81436051 is about 433.4498948105.

Adding to 81436051 its reverse (15063418), we get a palindrome (96499469).

The spelling of 81436051 in words is "eighty-one million, four hundred thirty-six thousand, fifty-one".