81003215 has 8 divisors (see below), whose sum is σ = 102921840. Its totient is φ = 60990592.

The previous prime is 81003187. The next prime is 81003229. The reversal of 81003215 is 51230018.

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

It is a cyclic number.

It is not a de Polignac number, because 81003215 - 2⁶ = 81003151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476405 + ... + 476574.

It is an arithmetic number, because the mean of its divisors is an integer number (12865230).

Almost surely, 2^81003215 is an apocalyptic number.

81003215 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81003215 is a deficient number, since it is larger than the sum of its proper divisors (21918625).

81003215 is a wasteful number, since it uses less digits than its factorization.

81003215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953001.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 81003215 is about 9000.1786093388. The cubic root of 81003215 is about 432.6805955009.

It can be divided in two parts, 81003 and 215, that added together give a palindrome (81218).

The spelling of 81003215 in words is "eighty-one million, three thousand, two hundred fifteen".