81235016 has 8 divisors (see below), whose sum is σ = 152315670. Its totient is φ = 40617504.

The previous prime is 81234997. The next prime is 81235019. The reversal of 81235016 is 61053218.

It can be written as a sum of positive squares in only one way, i.e., 80174116 + 1060900 = 8954^2 + 1030^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (81235019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5077181 + ... + 5077196.

Almost surely, 2^81235016 is an apocalyptic number.

It is an amenable number.

81235016 is a deficient number, since it is larger than the sum of its proper divisors (71080654).

81235016 is a wasteful number, since it uses less digits than its factorization.

81235016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10154383 (or 10154379 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 81235016 is about 9013.0469875620. The cubic root of 81235016 is about 433.0929259530.

The spelling of 81235016 in words is "eighty-one million, two hundred thirty-five thousand, sixteen".