81486007481 has 4 divisors (see below), whose sum is σ = 81491718912. Its totient is φ = 81480296052.

The previous prime is 81486007457. The next prime is 81486007487. The reversal of 81486007481 is 18470068418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81486007481 - 2³⁰ = 80412265657 is a prime.

It is a super-2 number, since 2×81486007481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81486007487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834261 + ... + 2862866.

It is an arithmetic number, because the mean of its divisors is an integer number (20372929728).

Almost surely, 2^81486007481 is an apocalyptic number.

It is an amenable number.

81486007481 is a deficient number, since it is larger than the sum of its proper divisors (5711431).

81486007481 is a wasteful number, since it uses less digits than its factorization.

81486007481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5711430.

The product of its (nonzero) digits is 344064, while the sum is 47.

The spelling of 81486007481 in words is "eighty-one billion, four hundred eighty-six million, seven thousand, four hundred eighty-one".