91661653 has 4 divisors (see below), whose sum is σ = 91775488. Its totient is φ = 91547820.

The previous prime is 91661651. The next prime is 91661659. The reversal of 91661653 is 35616619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35616619 = 61 ⋅583879.

It is a cyclic number.

It is not a de Polignac number, because 91661653 - 2¹ = 91661651 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 (91661651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55701 + ... + 57322.

It is an arithmetic number, because the mean of its divisors is an integer number (22943872).

Almost surely, 2^91661653 is an apocalyptic number.

It is an amenable number.

91661653 is a deficient number, since it is larger than the sum of its proper divisors (113835).

91661653 is a wasteful number, since it uses less digits than its factorization.

91661653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113834.

The product of its digits is 29160, while the sum is 37.

The square root of 91661653 is about 9574.0092437808. The cubic root of 91661653 is about 450.8816509438.

The spelling of 91661653 in words is "ninety-one million, six hundred sixty-one thousand, six hundred fifty-three".