81682051 has 16 divisors (see below), whose sum is σ = 92504160. Its totient is φ = 71470080.

The previous prime is 81682049. The next prime is 81682057. The reversal of 81682051 is 15028618.

It is not a de Polignac number, because 81682051 - 2¹ = 81682049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81682057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38445 + ... + 40513.

It is an arithmetic number, because the mean of its divisors is an integer number (5781510).

Almost surely, 2^81682051 is an apocalyptic number.

81682051 is a deficient number, since it is larger than the sum of its proper divisors (10822109).

81682051 is a wasteful number, since it uses less digits than its factorization.

81682051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 81682051 is about 9037.8122905933. The cubic root of 81682051 is about 433.8859076310.

The spelling of 81682051 in words is "eighty-one million, six hundred eighty-two thousand, fifty-one".