91225643281 has 8 divisors (see below), whose sum is σ = 91456706880. Its totient is φ = 90994644048.

The previous prime is 91225643269. The next prime is 91225643303. The reversal of 91225643281 is 18234652219.

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 91225643281 - 2⁹ = 91225642769 is a prime.

It is a super-2 number, since 2×91225643281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91225643231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4182055 + ... + 4203811.

It is an arithmetic number, because the mean of its divisors is an integer number (11432088360).

Almost surely, 2^91225643281 is an apocalyptic number.

It is an amenable number.

91225643281 is a deficient number, since it is larger than the sum of its proper divisors (231063599).

91225643281 is a wasteful number, since it uses less digits than its factorization.

91225643281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32183.

The product of its digits is 207360, while the sum is 43.

The spelling of 91225643281 in words is "ninety-one billion, two hundred twenty-five million, six hundred forty-three thousand, two hundred eighty-one".