81341747 has 2 divisors, whose sum is σ = 81341748. Its totient is φ = 81341746.

The previous prime is 81341683. The next prime is 81341749. The reversal of 81341747 is 74714318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81341747 - 2⁶ = 81341683 is a prime.

Together with 81341749, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81341749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670873 + 40670874.

It is an arithmetic number, because the mean of its divisors is an integer number (40670874).

Almost surely, 2^81341747 is an apocalyptic number.

81341747 is a deficient number, since it is larger than the sum of its proper divisors (1).

81341747 is an equidigital number, since it uses as much as digits as its factorization.

81341747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 35.

The square root of 81341747 is about 9018.9659606853. The cubic root of 81341747 is about 433.2825166577.

The spelling of 81341747 in words is "eighty-one million, three hundred forty-one thousand, seven hundred forty-seven".