91989061 has 8 divisors (see below), whose sum is σ = 93106944. Its totient is φ = 90877920.

The previous prime is 91989019. The next prime is 91989103. The reversal of 91989061 is 16098919.

It is an interprime number because it is at equal distance from previous prime (91989019) and next prime (91989103).

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 91989061 - 2⁷ = 91988933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91988999 and 91989017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91989361) 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, 29046 + ... + 32056.

It is an arithmetic number, because the mean of its divisors is an integer number (11638368).

Almost surely, 2^91989061 is an apocalyptic number.

It is an amenable number.

91989061 is a deficient number, since it is larger than the sum of its proper divisors (1117883).

91989061 is a wasteful number, since it uses less digits than its factorization.

91989061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 91989061 is about 9591.0927948800. The cubic root of 91989061 is about 451.4178506078.

The spelling of 91989061 in words is "ninety-one million, nine hundred eighty-nine thousand, sixty-one".