81952147 has 2 divisors, whose sum is σ = 81952148. Its totient is φ = 81952146.

The previous prime is 81952139. The next prime is 81952163. The reversal of 81952147 is 74125918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81952147 - 2³ = 81952139 is a prime.

It is not a weakly prime, because it can be changed into another prime (81952177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40976073 + 40976074.

It is an arithmetic number, because the mean of its divisors is an integer number (40976074).

Almost surely, 2^81952147 is an apocalyptic number.

81952147 is a deficient number, since it is larger than the sum of its proper divisors (1).

81952147 is an equidigital number, since it uses as much as digits as its factorization.

81952147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 81952147 is about 9052.7425126312. The cubic root of 81952147 is about 434.3636213709.

The spelling of 81952147 in words is "eighty-one million, nine hundred fifty-two thousand, one hundred forty-seven".