81701512 has 16 divisors (see below), whose sum is σ = 153306000. Its totient is φ = 40819920.

The previous prime is 81701483. The next prime is 81701519. The reversal of 81701512 is 21510718.

It is a super-2 number, since 2×81701512² = 13350274126172288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81701519) 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 3 ways as a sum of consecutive naturals, for example, 10587 + ... + 16597.

It is an arithmetic number, because the mean of its divisors is an integer number (9581625).

Almost surely, 2^81701512 is an apocalyptic number.

It is an amenable number.

81701512 is a deficient number, since it is larger than the sum of its proper divisors (71604488).

81701512 is a wasteful number, since it uses less digits than its factorization.

81701512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716 (or 7712 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 81701512 is about 9038.8888697671. Note that the first 4 decimals coincide. The cubic root of 81701512 is about 433.9203631124.

The spelling of 81701512 in words is "eighty-one million, seven hundred one thousand, five hundred twelve".