81783371 has 8 divisors (see below), whose sum is σ = 83325024. Its totient is φ = 80248320.

The previous prime is 81783347. The next prime is 81783421. The reversal of 81783371 is 17338718.

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

It is a cyclic number.

It is not a de Polignac number, because 81783371 - 2¹⁴ = 81766987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81783071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28331 + ... + 31083.

It is an arithmetic number, because the mean of its divisors is an integer number (10415628).

Almost surely, 2^81783371 is an apocalyptic number.

81783371 is a deficient number, since it is larger than the sum of its proper divisors (1541653).

81783371 is a wasteful number, since it uses less digits than its factorization.

81783371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301.

The product of its digits is 28224, while the sum is 38.

The square root of 81783371 is about 9043.4158922389. The cubic root of 81783371 is about 434.0652336695.

The spelling of 81783371 in words is "eighty-one million, seven hundred eighty-three thousand, three hundred seventy-one".