81491483527 has 4 divisors (see below), whose sum is σ = 81492269056. Its totient is φ = 81490698000.

The previous prime is 81491483503. The next prime is 81491483537. The reversal of 81491483527 is 72538419418.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81491483527 - 2¹⁵ = 81491450759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81491483537) 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, 208263 + ... + 454264.

It is an arithmetic number, because the mean of its divisors is an integer number (20373067264).

Almost surely, 2^81491483527 is an apocalyptic number.

81491483527 is a deficient number, since it is larger than the sum of its proper divisors (785529).

81491483527 is a wasteful number, since it uses less digits than its factorization.

81491483527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785528.

The product of its digits is 1935360, while the sum is 52.

The spelling of 81491483527 in words is "eighty-one billion, four hundred ninety-one million, four hundred eighty-three thousand, five hundred twenty-seven".