81241194393 has 48 divisors (see below), whose sum is σ = 120315948480. Its totient is φ = 52812035712.

The previous prime is 81241194373. The next prime is 81241194443. The reversal of 81241194393 is 39349114218.

81241194393 is a `hidden beast` number, since 8 + 1 + 241 + 19 + 4 + 393 = 666.

It is not a de Polignac number, because 81241194393 - 2¹² = 81241190297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81241194323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23417463 + ... + 23420931.

It is an arithmetic number, because the mean of its divisors is an integer number (2506582260).

Almost surely, 2^81241194393 is an apocalyptic number.

81241194393 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81241194393 is a deficient number, since it is larger than the sum of its proper divisors (39074754087).

81241194393 is a wasteful number, since it uses less digits than its factorization.

81241194393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958 (or 3955 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 81241194393 in words is "eighty-one billion, two hundred forty-one million, one hundred ninety-four thousand, three hundred ninety-three".