91018930225 has 6 divisors (see below), whose sum is σ = 112863473510. Its totient is φ = 72815144160.

The previous prime is 91018930199. The next prime is 91018930231. The reversal of 91018930225 is 52203981019.

It can be written as a sum of positive squares in 3 ways, for example, as 995528704 + 90023401521 = 31552^2 + 300039^2 .

It is not a de Polignac number, because 91018930225 - 2¹¹ = 91018928177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1820378580 + ... + 1820378629.

Almost surely, 2^91018930225 is an apocalyptic number.

It is an amenable number.

91018930225 is a deficient number, since it is larger than the sum of its proper divisors (21844543285).

91018930225 is a wasteful number, since it uses less digits than its factorization.

91018930225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640757219 (or 3640757214 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 91018930225 in words is "ninety-one billion, eighteen million, nine hundred thirty thousand, two hundred twenty-five".