81241211455 has 8 divisors (see below), whose sum is σ = 101728125792. Its totient is φ = 62167187808.

The previous prime is 81241211453. The next prime is 81241211473. The reversal of 81241211455 is 55411214218.

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 81241211455 - 2¹ = 81241211453 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 81241211455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241211453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353222544 + ... + 353222773.

It is an arithmetic number, because the mean of its divisors is an integer number (12716015724).

Almost surely, 2^81241211455 is an apocalyptic number.

81241211455 is a deficient number, since it is larger than the sum of its proper divisors (20486914337).

81241211455 is a wasteful number, since it uses less digits than its factorization.

81241211455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706445345.

The product of its digits is 12800, while the sum is 34.

The spelling of 81241211455 in words is "eighty-one billion, two hundred forty-one million, two hundred eleven thousand, four hundred fifty-five".