91705454621 has 16 divisors (see below), whose sum is σ = 100311581760. Its totient is φ = 83144517120.

The previous prime is 91705454593. The next prime is 91705454623. The reversal of 91705454621 is 12645450719.

It is a cyclic number.

It is not a de Polignac number, because 91705454621 - 2¹⁸ = 91705192477 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 (91705454623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6529835 + ... + 6543863.

It is an arithmetic number, because the mean of its divisors is an integer number (6269473860).

Almost surely, 2^91705454621 is an apocalyptic number.

It is an amenable number.

91705454621 is a deficient number, since it is larger than the sum of its proper divisors (8606127139).

91705454621 is a wasteful number, since it uses less digits than its factorization.

91705454621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15596.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 91705454621 in words is "ninety-one billion, seven hundred five million, four hundred fifty-four thousand, six hundred twenty-one".