81026015 has 8 divisors (see below), whose sum is σ = 111121440. Its totient is φ = 55560672.

The previous prime is 81026009. The next prime is 81026021. The reversal of 81026015 is 51062018.

It is an interprime number because it is at equal distance from previous prime (81026009) and next prime (81026021).

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 81026015 - 2⁴ = 81025999 is a prime.

It is a super-3 number, since 3×81026015³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157480 + ... + 1157549.

It is an arithmetic number, because the mean of its divisors is an integer number (13890180).

Almost surely, 2^81026015 is an apocalyptic number.

81026015 is a deficient number, since it is larger than the sum of its proper divisors (30095425).

81026015 is a wasteful number, since it uses less digits than its factorization.

81026015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315041.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81026015 is about 9001.4451617504. The cubic root of 81026015 is about 432.7211872731.

The spelling of 81026015 in words is "eighty-one million, twenty-six thousand, fifteen".