91654721 has 8 divisors (see below), whose sum is σ = 94756200. Its totient is φ = 88594560.

The previous prime is 91654709. The next prime is 91654723. The reversal of 91654721 is 12745619.

It can be written as a sum of positive squares in 4 ways, for example, as 261121 + 91393600 = 511^2 + 9560^2 .

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 91654721 - 2⁶ = 91654657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91654723) 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, 5786 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (11844525).

Almost surely, 2^91654721 is an apocalyptic number.

It is an amenable number.

91654721 is a deficient number, since it is larger than the sum of its proper divisors (3101479).

91654721 is a wasteful number, since it uses less digits than its factorization.

91654721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20659.

The product of its digits is 15120, while the sum is 35.

The square root of 91654721 is about 9573.6472151422. The cubic root of 91654721 is about 450.8702845389.

The spelling of 91654721 in words is "ninety-one million, six hundred fifty-four thousand, seven hundred twenty-one".