81654371 has 2 divisors, whose sum is σ = 81654372. Its totient is φ = 81654370.

The previous prime is 81654323. The next prime is 81654379. The reversal of 81654371 is 17345618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81654371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81654379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40827185 + 40827186.

It is an arithmetic number, because the mean of its divisors is an integer number (40827186).

Almost surely, 2^81654371 is an apocalyptic number.

81654371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81654371 is an equidigital number, since it uses as much as digits as its factorization.

81654371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 81654371 is about 9036.2808167963. The cubic root of 81654371 is about 433.8368910737.

Adding to 81654371 its reverse (17345618), we get a palindrome (98999989).

The spelling of 81654371 in words is "eighty-one million, six hundred fifty-four thousand, three hundred seventy-one".