91505945 has 16 divisors (see below), whose sum is σ = 112555008. Its totient is φ = 71384640.

The previous prime is 91505929. The next prime is 91505959. The reversal of 91505945 is 54950519.

It is not a de Polignac number, because 91505945 - 2⁴ = 91505929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91505899 and 91505908.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85715 + ... + 86775.

It is an arithmetic number, because the mean of its divisors is an integer number (7034688).

Almost surely, 2^91505945 is an apocalyptic number.

It is an amenable number.

91505945 is a deficient number, since it is larger than the sum of its proper divisors (21049063).

91505945 is a wasteful number, since it uses less digits than its factorization.

91505945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 91505945 is about 9565.8739799351. The cubic root of 91505945 is about 450.6261981677.

The spelling of 91505945 in words is "ninety-one million, five hundred five thousand, nine hundred forty-five".