81012393 has 80 divisors (see below), whose sum is σ = 156119040. Its totient is φ = 40629600.

The previous prime is 81012377. The next prime is 81012413. The reversal of 81012393 is 39321018.

It is not a de Polignac number, because 81012393 - 2⁴ = 81012377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81012193) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 193138 + ... + 193556.

It is an arithmetic number, because the mean of its divisors is an integer number (1951488).

Almost surely, 2^81012393 is an apocalyptic number.

It is an amenable number.

81012393 is a deficient number, since it is larger than the sum of its proper divisors (75106647).

81012393 is a wasteful number, since it uses less digits than its factorization.

81012393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 81012393 is about 9000.6884736669. The cubic root of 81012393 is about 432.6969363854.

It can be divided in two parts, 810 and 12393, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 81012393 in words is "eighty-one million, twelve thousand, three hundred ninety-three".