91771970 has 32 divisors (see below), whose sum is σ = 168255360. Its totient is φ = 36034560.

The previous prime is 91771969. The next prime is 91771987. The reversal of 91771970 is 7917719.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142850 + ... + 143490.

It is an arithmetic number, because the mean of its divisors is an integer number (5257980).

Almost surely, 2^91771970 is an apocalyptic number.

91771970 is a deficient number, since it is larger than the sum of its proper divisors (76483390).

91771970 is a wasteful number, since it uses less digits than its factorization.

91771970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 27783, while the sum is 41.

The square root of 91771970 is about 9579.7687863539. The cubic root of 91771970 is about 451.0624607241.

The spelling of 91771970 in words is "ninety-one million, seven hundred seventy-one thousand, nine hundred seventy".