91521611 has 8 divisors (see below), whose sum is σ = 92418000. Its totient is φ = 90629280.

The previous prime is 91521607. The next prime is 91521667. The reversal of 91521611 is 11612519.

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 91521611 - 2² = 91521607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91521691) 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, 62000 + ... + 63458.

It is an arithmetic number, because the mean of its divisors is an integer number (11552250).

Almost surely, 2^91521611 is an apocalyptic number.

91521611 is a deficient number, since it is larger than the sum of its proper divisors (896389).

91521611 is a wasteful number, since it uses less digits than its factorization.

91521611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029.

The product of its digits is 540, while the sum is 26.

The square root of 91521611 is about 9566.6927932280. The cubic root of 91521611 is about 450.6519127344.

The spelling of 91521611 in words is "ninety-one million, five hundred twenty-one thousand, six hundred eleven".