81508629 has 8 divisors (see below), whose sum is σ = 108746080. Its totient is φ = 54305136.

The previous prime is 81508621. The next prime is 81508633. The reversal of 81508629 is 92680518.

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

It is not a de Polignac number, because 81508629 - 2³ = 81508621 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 (81508621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2227 + ... + 12960.

It is an arithmetic number, because the mean of its divisors is an integer number (13593260).

Almost surely, 2^81508629 is an apocalyptic number.

It is an amenable number.

81508629 is a deficient number, since it is larger than the sum of its proper divisors (27237451).

81508629 is a wasteful number, since it uses less digits than its factorization.

81508629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16979.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 81508629 is about 9028.2129460929. The cubic root of 81508629 is about 433.5786239791.

The spelling of 81508629 in words is "eighty-one million, five hundred eight thousand, six hundred twenty-nine".