81241293 has 16 divisors (see below), whose sum is σ = 123944960. Its totient is φ = 46367856.

The previous prime is 81241291. The next prime is 81241301. The reversal of 81241293 is 39214218.

It is not a de Polignac number, because 81241293 - 2¹ = 81241291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81241293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21048 + ... + 24606.

It is an arithmetic number, because the mean of its divisors is an integer number (7746560).

Almost surely, 2^81241293 is an apocalyptic number.

It is an amenable number.

81241293 is a deficient number, since it is larger than the sum of its proper divisors (42703667).

81241293 is a wasteful number, since it uses less digits than its factorization.

81241293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its digits is 3456, while the sum is 30.

The square root of 81241293 is about 9013.3951982591. The cubic root of 81241293 is about 433.1040806431.

The spelling of 81241293 in words is "eighty-one million, two hundred forty-one thousand, two hundred ninety-three".