81351849 has 8 divisors (see below), whose sum is σ = 108578272. Its totient is φ = 54180000.

The previous prime is 81351847. The next prime is 81351883. The reversal of 81351849 is 94815318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81351849 - 2¹ = 81351847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81351841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10027 + ... + 16224.

It is an arithmetic number, because the mean of its divisors is an integer number (13572284).

Almost surely, 2^81351849 is an apocalyptic number.

It is an amenable number.

81351849 is a deficient number, since it is larger than the sum of its proper divisors (27226423).

81351849 is a wasteful number, since it uses less digits than its factorization.

81351849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27287.

The product of its digits is 34560, while the sum is 39.

The square root of 81351849 is about 9019.5259853276. The cubic root of 81351849 is about 433.3004526662.

The spelling of 81351849 in words is "eighty-one million, three hundred fifty-one thousand, eight hundred forty-nine".