91990655 has 8 divisors (see below), whose sum is σ = 116882352. Its totient is φ = 69263488.

The previous prime is 91990651. The next prime is 91990673. The reversal of 91990655 is 55609919.

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 91990655 - 2² = 91990651 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 (91990651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541037 + ... + 541206.

It is an arithmetic number, because the mean of its divisors is an integer number (14610294).

Almost surely, 2^91990655 is an apocalyptic number.

91990655 is a deficient number, since it is larger than the sum of its proper divisors (24891697).

91990655 is a wasteful number, since it uses less digits than its factorization.

91990655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082265.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 91990655 is about 9591.1758924545. The cubic root of 91990655 is about 451.4204580044.

The spelling of 91990655 in words is "ninety-one million, nine hundred ninety thousand, six hundred fifty-five".