81652247 has 2 divisors, whose sum is σ = 81652248. Its totient is φ = 81652246.

The previous prime is 81652243. The next prime is 81652261. The reversal of 81652247 is 74225618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81652247 - 2² = 81652243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81652243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40826123 + 40826124.

It is an arithmetic number, because the mean of its divisors is an integer number (40826124).

Almost surely, 2^81652247 is an apocalyptic number.

81652247 is a deficient number, since it is larger than the sum of its proper divisors (1).

81652247 is an equidigital number, since it uses as much as digits as its factorization.

81652247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 81652247 is about 9036.1632898039. The cubic root of 81652247 is about 433.8331293745.

The spelling of 81652247 in words is "eighty-one million, six hundred fifty-two thousand, two hundred forty-seven".