81952549 has 6 divisors (see below), whose sum is σ = 95332614. Its totient is φ = 70245000.

The previous prime is 81952547. The next prime is 81952553. The reversal of 81952549 is 94525918.

It can be written as a sum of positive squares in only one way, i.e., 67076100 + 14876449 = 8190^2 + 3857^2 .

It is not a de Polignac number, because 81952549 - 2¹ = 81952547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81952547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 836202 + ... + 836299.

It is an arithmetic number, because the mean of its divisors is an integer number (15888769).

Almost surely, 2^81952549 is an apocalyptic number.

It is an amenable number.

81952549 is a deficient number, since it is larger than the sum of its proper divisors (13380065).

81952549 is a wasteful number, since it uses less digits than its factorization.

81952549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672515 (or 1672508 counting only the distinct ones).

The product of its digits is 129600, while the sum is 43.

The square root of 81952549 is about 9052.7647158202. The cubic root of 81952549 is about 434.3643315980.

The spelling of 81952549 in words is "eighty-one million, nine hundred fifty-two thousand, five hundred forty-nine".