91428452821 has 8 divisors (see below), whose sum is σ = 91738128384. Its totient is φ = 91119147600.

The previous prime is 91428452803. The next prime is 91428452837. The reversal of 91428452821 is 12825482419.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91428452821 - 2¹⁵ = 91428420053 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 (91428452021) 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, 406540 + ... + 590026.

It is an arithmetic number, because the mean of its divisors is an integer number (11467266048).

Almost surely, 2^91428452821 is an apocalyptic number.

It is an amenable number.

91428452821 is a deficient number, since it is larger than the sum of its proper divisors (309675563).

91428452821 is a wasteful number, since it uses less digits than its factorization.

91428452821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185171.

The product of its digits is 368640, while the sum is 46.

The spelling of 91428452821 in words is "ninety-one billion, four hundred twenty-eight million, four hundred fifty-two thousand, eight hundred twenty-one".