81029832491 has 8 divisors (see below), whose sum is σ = 81291381600. Its totient is φ = 80768674368.

The previous prime is 81029832473. The next prime is 81029832493. The reversal of 81029832491 is 19423892018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81029832491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81029832493) 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, 320285 + ... + 514433.

It is an arithmetic number, because the mean of its divisors is an integer number (10161422700).

Almost surely, 2^81029832491 is an apocalyptic number.

81029832491 is a deficient number, since it is larger than the sum of its proper divisors (261549109).

81029832491 is a wasteful number, since it uses less digits than its factorization.

81029832491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195493.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 81029832491 in words is "eighty-one billion, twenty-nine million, eight hundred thirty-two thousand, four hundred ninety-one".