91771964 has 12 divisors (see below), whose sum is σ = 160677888. Its totient is φ = 45864000.

The previous prime is 91771961. The next prime is 91771969. The reversal of 91771964 is 46917719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91771961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7109 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (13389824).

Almost surely, 2^91771964 is an apocalyptic number.

It is an amenable number.

91771964 is a deficient number, since it is larger than the sum of its proper divisors (68905924).

91771964 is a wasteful number, since it uses less digits than its factorization.

91771964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10996 (or 10994 counting only the distinct ones).

The product of its digits is 95256, while the sum is 44.

The square root of 91771964 is about 9579.7684731939. The cubic root of 91771964 is about 451.0624508940.

The spelling of 91771964 in words is "ninety-one million, seven hundred seventy-one thousand, nine hundred sixty-four".