81050697 has 24 divisors (see below), whose sum is σ = 144091584. Its totient is φ = 42751584.

The previous prime is 81050693. The next prime is 81050699. The reversal of 81050697 is 79605018.

It is not a de Polignac number, because 81050697 - 2² = 81050693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81050693) 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 23 ways as a sum of consecutive naturals, for example, 48663 + ... + 50300.

It is an arithmetic number, because the mean of its divisors is an integer number (6003816).

Almost surely, 2^81050697 is an apocalyptic number.

It is an amenable number.

81050697 is a deficient number, since it is larger than the sum of its proper divisors (63040887).

81050697 is a wasteful number, since it uses less digits than its factorization.

81050697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98989 (or 98986 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 81050697 is about 9002.8160594338. The cubic root of 81050697 is about 432.7651210641.

The spelling of 81050697 in words is "eighty-one million, fifty thousand, six hundred ninety-seven".