81601727 has 2 divisors, whose sum is σ = 81601728. Its totient is φ = 81601726.

The previous prime is 81601643. The next prime is 81601763. The reversal of 81601727 is 72710618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81601727 - 2²² = 77407423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81601693 and 81601702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81601627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40800863 + 40800864.

It is an arithmetic number, because the mean of its divisors is an integer number (40800864).

Almost surely, 2^81601727 is an apocalyptic number.

81601727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81601727 is an equidigital number, since it uses as much as digits as its factorization.

81601727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 81601727 is about 9033.3674230599. The cubic root of 81601727 is about 433.7436369548.

It can be divided in two parts, 81601 and 727, that added together give a palindrome (82328).

The spelling of 81601727 in words is "eighty-one million, six hundred one thousand, seven hundred twenty-seven".