91023661 has 8 divisors (see below), whose sum is σ = 101450880. Its totient is φ = 81160128.

The previous prime is 91023659. The next prime is 91023677. The reversal of 91023661 is 16632019.

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 91023661 - 2¹ = 91023659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91023641) 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, 140581 + ... + 141226.

It is an arithmetic number, because the mean of its divisors is an integer number (12681360).

Almost surely, 2^91023661 is an apocalyptic number.

It is an amenable number.

91023661 is a deficient number, since it is larger than the sum of its proper divisors (10427219).

91023661 is a wasteful number, since it uses less digits than its factorization.

91023661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281843.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91023661 is about 9540.6321069413. The cubic root of 91023661 is about 449.8331249561.

The spelling of 91023661 in words is "ninety-one million, twenty-three thousand, six hundred sixty-one".