81550527 has 8 divisors (see below), whose sum is σ = 114456960. Its totient is φ = 51505560.

The previous prime is 81550507. The next prime is 81550543. The reversal of 81550527 is 72505518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81550527 - 2⁶ = 81550463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81550507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715299 + ... + 715412.

It is an arithmetic number, because the mean of its divisors is an integer number (14307120).

Almost surely, 2^81550527 is an apocalyptic number.

81550527 is a deficient number, since it is larger than the sum of its proper divisors (32906433).

81550527 is a wasteful number, since it uses less digits than its factorization.

81550527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430733.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 81550527 is about 9030.5330407457. The cubic root of 81550527 is about 433.6529022719.

The spelling of 81550527 in words is "eighty-one million, five hundred fifty thousand, five hundred twenty-seven".