91905925771 has 16 divisors (see below), whose sum is σ = 101572416000. Its totient is φ = 82458885600.

The previous prime is 91905925747. The next prime is 91905925799. The reversal of 91905925771 is 17752950919.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91905925771 - 2¹¹ = 91905923723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91905925271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2194336 + ... + 2235826.

It is an arithmetic number, because the mean of its divisors is an integer number (6348276000).

Almost surely, 2^91905925771 is an apocalyptic number.

91905925771 is a deficient number, since it is larger than the sum of its proper divisors (9666490229).

91905925771 is a wasteful number, since it uses less digits than its factorization.

91905925771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44130.

The product of its (nonzero) digits is 1786050, while the sum is 55.

The spelling of 91905925771 in words is "ninety-one billion, nine hundred five million, nine hundred twenty-five thousand, seven hundred seventy-one".