81429707 has 2 divisors, whose sum is σ = 81429708. Its totient is φ = 81429706.

The previous prime is 81429613. The next prime is 81429743. The reversal of 81429707 is 70792418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81429707 - 2¹² = 81425611 is a prime.

It is not a weakly prime, because it can be changed into another prime (81429757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40714853 + 40714854.

It is an arithmetic number, because the mean of its divisors is an integer number (40714854).

Almost surely, 2^81429707 is an apocalyptic number.

81429707 is a deficient number, since it is larger than the sum of its proper divisors (1).

81429707 is an equidigital number, since it uses as much as digits as its factorization.

81429707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 81429707 is about 9023.8410336176. The cubic root of 81429707 is about 433.4386390358.

The spelling of 81429707 in words is "eighty-one million, four hundred twenty-nine thousand, seven hundred seven".