81411047 has 2 divisors, whose sum is σ = 81411048. Its totient is φ = 81411046.

The previous prime is 81411037. The next prime is 81411089. The reversal of 81411047 is 74011418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81411047 is a 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 (81411037) 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, 40705523 + 40705524.

It is an arithmetic number, because the mean of its divisors is an integer number (40705524).

Almost surely, 2^81411047 is an apocalyptic number.

81411047 is a deficient number, since it is larger than the sum of its proper divisors (1).

81411047 is an equidigital number, since it uses as much as digits as its factorization.

81411047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 81411047 is about 9022.8070465903. The cubic root of 81411047 is about 433.4055283395.

It can be divided in two parts, 8 and 1411047, that multiplied together give a triangular number (11288376 = T₄₇₅₁).

The spelling of 81411047 in words is "eighty-one million, four hundred eleven thousand, forty-seven".