81573827 has 2 divisors, whose sum is σ = 81573828. Its totient is φ = 81573826.

The previous prime is 81573809. The next prime is 81573841. The reversal of 81573827 is 72837518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81573827 - 2¹² = 81569731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81573857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40786913 + 40786914.

It is an arithmetic number, because the mean of its divisors is an integer number (40786914).

Almost surely, 2^81573827 is an apocalyptic number.

81573827 is a deficient number, since it is larger than the sum of its proper divisors (1).

81573827 is an equidigital number, since it uses as much as digits as its factorization.

81573827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The square root of 81573827 is about 9031.8230164237. The cubic root of 81573827 is about 433.6941983487.

The spelling of 81573827 in words is "eighty-one million, five hundred seventy-three thousand, eight hundred twenty-seven".