81000526 has 8 divisors (see below), whose sum is σ = 126783504. Its totient is φ = 38739360.

The previous prime is 81000523. The next prime is 81000533. The reversal of 81000526 is 62500018.

It is a happy number.

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

It is a super-2 number, since 2×81000526² = 13122170424553352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81000497 and 81000506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880395 + ... + 880486.

It is an arithmetic number, because the mean of its divisors is an integer number (15847938).

Almost surely, 2^81000526 is an apocalyptic number.

81000526 is a deficient number, since it is larger than the sum of its proper divisors (45782978).

81000526 is a wasteful number, since it uses less digits than its factorization.

81000526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760906.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81000526 is about 9000.0292221748. The cubic root of 81000526 is about 432.6758076621.

The spelling of 81000526 in words is "eighty-one million, five hundred twenty-six", and thus it is an aban number.